{"id":7867,"date":"2023-05-28T13:41:00","date_gmt":"2023-05-28T08:11:00","guid":{"rendered":"https:\/\/www.pcvita.com\/blog\/?p=7867"},"modified":"2026-09-01T10:39:01","modified_gmt":"2026-09-01T05:09:01","slug":"tenant-to-tenant-migration-step-by-step","status":"publish","type":"post","link":"https:\/\/www.pcvita.com\/blog\/tenant-to-tenant-migration-step-by-step.html","title":{"rendered":"Office 365 Tenant to Tenant Migration: Step-by-Step Guide 2026"},"content":{"rendered":"<div class=\"alert alert-warning\">\n<p><strong>In this 2026 Office 365 tenant to tenant migration step-by-step guide, you will learn about:<\/strong><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><strong>Types of Microsoft 365 migrations.<\/strong><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><strong>Manual, native, and third-party migration paths.<\/strong><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><strong>Workload-by-workload strategy.<\/strong><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><strong>PowerShell cmdlets to migrate Microsoft 365 from one tenant to another\u00a0<\/strong><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><strong>PCVITA Office 365 to Office 365 Migration Tool (Best Office 365 tenant to tenant migration tool).<\/strong><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><strong>Post Migration Checklist<\/strong><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><strong>Common Migration Challenges and their expert solutions.<\/strong><\/li>\n<\/ul>\n<\/div>\n<p><span style=\"font-weight: 400;\">Do you know that, according to enterprise IT data, nearly <strong>80% of enterprise migration projects fail or experience critical delays?<\/strong> Yes, and the primary reason behind them is <strong>poor planning<\/strong>. And a<strong> fundamental misunderstanding of cloud infrastructure.<\/strong><\/span><\/p>\n<p><span style=\"font-weight: 400;\">The most common mistake IT admins make when performing an Office 365 cross-tenant migration is to interpret it as a basic <strong>\u201clift-and-shift\u201d<\/strong>. It is not just about moving data. It&#8217;s about preserving metadata, version history, and user permissions without disturbing business continuity.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">And since <strong>Microsoft 365 is a unified ecosystem, transferring workloads (Exchange, SharePoint, Teams) can be a high-stakes, intensive task<\/strong>. Seasoned IT professionals would agree on this.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">So, be it mergers and acquisitions (M&amp;A), divestitures, or corporate rebranding, check out this <strong>O365 tenant to tenant migration checklist<\/strong>. And conclude a secure Office 365 cross-tenant migration NOW!<\/span><\/p>\n<div class=\"card my-5 bg-menu\">\n<div class=\"card-header text-center font-weight-bold\">What You\u2019ll Learn <a class=\"badge badge-primary toc-hv\" href=\"#\" data-bs-toggle=\"collapse\" data-bs-target=\"#toc\" aria-expanded=\"true\">Hide<\/a><\/div>\n<div id=\"toc\" class=\"card-body collapse show\">\n<ol>\n<li><a class=\"scroll\" href=\"#types\">Types of Microsoft 365 Migrations<\/a><\/li>\n<li><a class=\"scroll\" href=\"#manual\">Manual vs. Native vs. Third-Party<\/a><\/li>\n<li><a class=\"scroll\" href=\"#the\">The Workload-by-Workload Strategy <\/a><\/li>\n<li><a class=\"scroll\" href=\"#office\">Office 365 Tenant to Tenant Migration: Step-by-Step Process<\/a><\/li>\n<li>\n<ul>\n<li><a class=\"scroll\" href=\"#directory\">#1: Directory Preparation and Identity Mapping<\/a><\/li>\n<li><a class=\"scroll\" href=\"#create\">#2: Create and Prepare Target MailUsers<\/a><\/li>\n<li><a class=\"scroll\" href=\"#register\">#3: Register the Entra ID Application<\/a><\/li>\n<li><a class=\"scroll\" href=\"#grant\">#4: Grant Source Tenant Consent<\/a><\/li>\n<li><a class=\"scroll\" href=\"#configure\">#5: Configure the Migration Endpoint<\/a><\/li>\n<li><a class=\"scroll\" href=\"#execute\">#6: Execute the Initial Sync (Pre-Stage Migration)<\/a><\/li>\n<li><a class=\"scroll\" href=\"#delta\">#7: Delta Syncs and DNS Cutover<\/a><\/li>\n<\/ul>\n<\/li>\n<li><a class=\"scroll\" href=\"#ultimate\">The Ultimate Solution<\/a><\/li>\n<li><a class=\"scroll\" href=\"#post\">Post Migration Checklist and Testing<\/a><\/li>\n<li><a class=\"scroll\" href=\"#common\">Common Challenges and Expert Solutions<\/a><\/li>\n<li><a class=\"scroll\" href=\"#final\">Final Words<\/a><\/li>\n<li><a class=\"scroll\" href=\"#faqs\">FAQs (Frequently Asked Questions)<\/a><\/li>\n<\/ol>\n<\/div>\n<\/div>\n<h2 id=\"types\"><strong>What are the Types of Microsoft 365 Migrations?<\/strong><\/h2>\n<p><span style=\"font-weight: 400;\"><strong><a href=\"https:\/\/www.pcvita.com\/blog\/migrate-mailboxes-from-one-tenant-to-another.html\">Migrating Microsoft 365 from one tenant to another<\/a><\/strong> is not a uniform execution. Therefore, at an architectural level, tenant migrations are primarily of two execution types: Cutover and Phased.<\/span><\/p>\n<h3><strong>The Cutover Migration:<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">A cutover migration refers to the process of moving the complete organization. Every mailbox, SharePoint site, and Teams channel is moved in a single, high-intensity event. It is an ideal solution for rapid spin-offs (Divestitures). Including small business acquisitions or rebranding efforts (low user count) to prevent Microsoft&#8217;s strict data throttling limits.<\/span><\/p>\n<p><b>Technical Configurations:<\/b><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Extract the custom domain from all the objects in the source tenant. Also, remove it from the Source Microsoft 365 Admin Center. Validate it in the Target tenant within a 48-hour window.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">To force Outlook client profile rebuilds throughout the endpoints at the same time via Intune or Group Policy requires a large, automated script.<\/span><\/li>\n<\/ul>\n<h3><strong>The Phased (Staged) Migration:\u00a0<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">A phased migration splits the user base into logical batches and moves them over several weeks or months. It is non-negotiable for enterprise M&amp;A because consolidating a large number of users into a parent tenant over a single weekend is impossible. Due to the sheer volume of SharePoint and OneDrive data.<\/span><\/p>\n<p><b>Technical Configurations:<\/b><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Execute an initial background sync. Move 90% of data (emails older than 30 days, orphaned OneDrive files) weeks before the user cuts over.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">To grant FreeBusyAccessLevel LimitedDetails and display calendar across the two environments, manually run the New-OrganizationRelationship PowerShell cmdlet in both tenants.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">The Target users are temporarily assigned the parent tenant\u2019s default *.<\/span><a href=\"http:\/\/onmicrosoft.com\"><span style=\"font-weight: 400;\">onmicrosoft.com<\/span><\/a><span style=\"font-weight: 400;\"> routing address. This will continue until the final batch is finished. And the legacy domain can then be fully cut from the source.<\/span><\/li>\n<\/ul>\n<h3><strong>Secondary Scenario Types to Consider:<\/strong><b><\/b><\/h3>\n<ul>\n<li aria-level=\"1\"><b>The M&amp;A Consolidation:<\/b><\/li>\n<\/ul>\n<ul>\n<li style=\"list-style-type: none;\">\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"2\"><span style=\"font-weight: 400;\">Requires Entra ID mapping.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"2\"><span style=\"font-weight: 400;\">Matching parent company\u2019s naming convention changes assigned users\u2019 UPN (Unique Principal Name).<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"2\"><span style=\"font-weight: 400;\">For mapping, rely on the source ObjectGUID or ExchangeGUID instead of the email address.<\/span><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<ul>\n<li aria-level=\"1\"><b>The Divestiture (Carve-Out):<\/b><\/li>\n<\/ul>\n<ul>\n<li style=\"list-style-type: none;\">\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"2\"><span style=\"font-weight: 400;\">Complex migration.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"2\"><span style=\"font-weight: 400;\">Native Microsoft tools cannot split a shared Teams Channel or SharePoint Site Collection.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"2\"><span style=\"font-weight: 400;\">Use third-party tools such as PCVITA or SysTools to perform meticulous item-level migrations.<\/span><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<ul>\n<li aria-level=\"1\"><b>Tenant Re-architecture (internal Rebranding):\u00a0<\/b><\/li>\n<\/ul>\n<ul>\n<li style=\"list-style-type: none;\">\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"2\"><span style=\"font-weight: 400;\">It is not a \u201clift and shift\u201d.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"2\"><span style=\"font-weight: 400;\">Requires deploying strict Microsoft Purview data lifecycle policies (in the source tenant to remove redundant data before the sync starts).<\/span><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Lastly, enterprise migrations do not fail because of poor tools. They failed because the wrong migration topology was implemented for the business requirement.<\/span><\/p>\n<h2 id=\"manual\"><strong>Manual vs. Native vs. Third-Party: Choose Your Migration Path<\/strong><\/h2>\n<p><span style=\"font-weight: 400;\">Choosing the right migration path (that aligns with the organizational needs and IT budget) is the most imperative architectural decision. And since IT admins are no longer restricted to just PowerShell scripts, they can choose native and third-party tools to transfer Office 365 tenants to another company.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Here is the side-by-side architecture comparison:<\/span><\/p>\n<table class=\"table table-bordered\">\n<tbody>\n<tr>\n<td>\n<p style=\"text-align: center;\"><b>Capability\/Requirement\u00a0<\/b><\/p>\n<\/td>\n<td style=\"text-align: center;\"><b>Manual (PowerShell)<\/b><\/td>\n<td style=\"text-align: center;\"><b>Native (Migration Orchestrator)<\/b><\/td>\n<td>\n<p style=\"text-align: center;\"><b>Third-Party (SysTools, BitTitan, PCVita)<\/b><\/p>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<p style=\"text-align: center;\"><b>Best Used For<\/b><\/p>\n<\/td>\n<td style=\"text-align: center;\">\n<p style=\"text-align: center;\"><span style=\"font-weight: 400;\">Small IT teams (with zero budget and under50 users).<\/span><\/p>\n<\/td>\n<td style=\"text-align: center;\"><span style=\"font-weight: 400;\">Mid-market to Enterprise (150+ users) with basic workloads.<\/span><\/td>\n<td style=\"text-align: center;\">\n<p style=\"text-align: center;\"><span style=\"font-weight: 400;\">Intense enterprise M&amp;A, Teams migrations, and strict coexistence needs.<\/span><\/p>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<p style=\"text-align: center;\"><b>Cost\/Licensing\u00a0<\/b><\/p>\n<\/td>\n<td style=\"text-align: center;\"><span style=\"font-weight: 400;\">Free (internal labour hours).<\/span><\/td>\n<td style=\"text-align: center;\"><span style=\"font-weight: 400;\">Mandates the Cross-Tenant User Data Migration SKU add-on.<\/span><\/td>\n<td>\n<p style=\"text-align: center;\"><span style=\"font-weight: 400;\">Per-user or per-GB software licensing fee.<\/span><\/p>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<p style=\"text-align: center;\"><b>Exchange &amp; OneDrive\u00a0<\/b><\/p>\n<\/td>\n<td style=\"text-align: center;\"><span style=\"font-weight: 400;\">Yes (Highly manual mapping).<\/span><\/td>\n<td style=\"text-align: center;\"><span style=\"font-weight: 400;\">Yes (Pre-stage and Delta sync supported).<\/span><\/td>\n<td>\n<p style=\"text-align: center;\"><span style=\"font-weight: 400;\">Yes (fully automated with error handling).<\/span><\/p>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<p style=\"text-align: center;\"><b>SharePoint Sites\u00a0<\/b><\/p>\n<\/td>\n<td style=\"text-align: center;\"><span style=\"font-weight: 400;\">No\u00a0<\/span><\/td>\n<td style=\"text-align: center;\"><span style=\"font-weight: 400;\">Yes (Content only; limits apply).<\/span><\/td>\n<td>\n<p style=\"text-align: center;\"><span style=\"font-weight: 400;\">Yes (Migrates metadata, custom web parts, and permissions.<\/span><\/p>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<p style=\"text-align: center;\"><b>Microsoft Teams<\/b><\/p>\n<\/td>\n<td style=\"text-align: center;\"><span style=\"font-weight: 400;\">No\u00a0<\/span><\/td>\n<td style=\"text-align: center;\"><span style=\"font-weight: 400;\">1:1 Chats only. Zero Channels or Tabs.<\/span><\/td>\n<td>\n<p style=\"text-align: center;\"><span style=\"font-weight: 400;\">Yes (Rebuilds standard, private, and shared channels.<\/span><\/p>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<p style=\"text-align: center;\"><b>Coexistence Support<\/b><\/p>\n<\/td>\n<td style=\"text-align: center;\"><span style=\"font-weight: 400;\">Requires manual configuration\u00a0<\/span><\/td>\n<td style=\"text-align: center;\"><span style=\"font-weight: 400;\">Limited (requires complex manual Org Relationships)<\/span><\/td>\n<td>\n<p style=\"text-align: center;\"><span style=\"font-weight: 400;\">Automated Calendar Free\/Busy and cross-tenant mail routing.<\/span><\/p>\n<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center;\"><b>Delta Syncs\u00a0<\/b><\/td>\n<td style=\"text-align: center;\"><span style=\"font-weight: 400;\">Complex to script reliably.<\/span><\/td>\n<td style=\"text-align: center;\"><span style=\"font-weight: 400;\">Supported for Exchange; Not supported for OneDrive<\/span><\/td>\n<td>\n<p style=\"text-align: center;\"><span style=\"font-weight: 400;\">Advanced multi-pass delta syncs across all workloads.<\/span><\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><img loading=\"lazy\" decoding=\"async\" class=\" wp-image-15776 aligncenter\" src=\"https:\/\/www.pcvita.com\/blog\/wp-content\/uploads\/2023\/05\/Screenshot-2026-08-17-150441.png\" alt=\"High-level architecture of migrating workloads across Microsoft 365 tenants\" width=\"617\" height=\"412\" \/><\/p>\n<h2 id=\"the\"><strong>The Workload-by-Workload Strategy\u00a0<\/strong><\/h2>\n<p><span style=\"font-weight: 400;\">Microsoft 365 is not a single database. It is a complex network of interconnected workloads. Many IT admins skip this critical aspect of an Office 365 tenant to tenant migration and continue with a basic \u201clift and shift\u201d approach at the enterprise level. Leading to migration failure.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Enterprise IT data reveals that over 1.83 million users were moved across 216 major M&amp;A tenant migrations between 2023 and 2025 alone. And all the successful M365 cross-tenant migrations used a phased, workload-by-workload strategy. It prioritised identity mapping first, followed by isolated data transitions.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">So, let\u2019s see the architecture differences across Exchange, OneDrive, SharePoint, and Teams.<\/span><\/p>\n<h3><strong>Phase 1: Identity &amp; Entra ID.\u00a0<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">Identity is the cornerstone of the entire Office 365 tenant to tenant migration. When a user\u2019s Entra ID identity is not mapped accurately, all workloads fail to transfer permissions. Resulting in orphaned files and bounced emails.\u00a0<\/span><\/p>\n<p><b>Technical Requirement:\u00a0<\/b><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Every user, security group, and Microsoft 365 Group must be pre-created. And mapped one-to-one.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Stamp the target users with the source user\u2019s exact ExchangeGuid and ArchiveGuid.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Avoid applying for a Microsoft 365 E3\/E5 license until the cutover. Otherwise, it will prematurely provision an empty mailbox. And break the sync pipeline.<\/span><\/li>\n<\/ul>\n<p><b>The Strategy:<\/b><span style=\"font-weight: 400;\"> Before merging two Office 365 tenants, use Cross-Tenant Identity Mapping (CTIM). Also, must create target MailUser objects in the destination tenant.<\/span><\/p>\n<h3><strong>Phase 2: Exchange Online (Mailboxes &amp; Calendars)<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">Being the most critical workload, Exchange is migrated as the first active workload. The native cross-tenant mailbox migration runs inside the Microsoft cloud. In simple words, the data never uses the public internet.<\/span><\/p>\n<p><b>Technical Requirement:<\/b><span style=\"font-weight: 400;\">\u00a0<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Requires the Cross-Tenant User Data Migration add-on license.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Microsoft\u2019s FastTrack cross-tenant migration preview asks for a minimum of 150 licenses for onboarding.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Native tools don&#8217;t move publicDelegates. IT admins have to utilize Exchange Online PowerShell to manually restamp \u2018Send on Behalf of and Full Access permissions (in the target tenant post-migration).<\/span><\/li>\n<\/ul>\n<p><b>The Strategy: <\/b><span style=\"font-weight: 400;\">Use a pre-stage sync to transfer and move 90% of mailbox data in the background. Followed by a delta sync over the cutover weekend.<\/span><\/p>\n<h3><strong>Phase 3: OneDrive for Business (Personal Content)\u00a0<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">To ensure shared links operate flawlessly for end users, OneDrive migrations natively drop a redirect URL in the source tenant.\u00a0<\/span><\/p>\n<p><b>Technical Requirements:<\/b><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">A single OneDrive account cannot exceed 5 TB of storage or 1,000,000 items (including files, versions, and folders).\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">The combined source file path, including the URL, cannot exceed 400 characters. Touching these strict limits causes silent migration failures.<\/span><\/li>\n<\/ul>\n<p><b>The Strategy: <\/b><span style=\"font-weight: 400;\">Migrate OneDrive in batches of up to 4,000 accounts concurrently. And since OneDrive migrations are a \u201cone-and-done\u201d activity, incremental delta passes are not supported natively.<\/span><\/p>\n<h3><strong>Phase 4: Shared Content (SharePoint &amp; Teams)<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">SharePoint migrations are comparatively more intense than OneDrive. This is because they involve deeply integrated permission structures, metadata, and custom site templates.<\/span><\/p>\n<p><b>Technical Requirement:\u00a0<\/b><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Migrating SharePoint natively mandates the Cross-Tenant Shared Data Migration License.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">It is sold per 100 GB of data and restricted primarily to Enterprise Agreement customers.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Merging a source site into an existing target site natively is not allowed.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">If the Service Encryption with Microsoft Pureview Customer key is active on the source tenant, the SharePoint migration will be hard-blocked.<\/span><\/li>\n<\/ul>\n<p><b>The Strategy: <\/b><span style=\"font-weight: 400;\">To establish an organizational trust, run the Set-SPOCrossTenantRelationship cmdlet. Followed by Add-SPOTenantIdentityMap to confirm guest and external users retain access.<\/span><\/p>\n<h3><strong>Phase 5: Platform &amp; Endpoints<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">Microsoft Teams architecture is split into two distinct parts. The chat interface is a layer for data stored across Exchange (1:1 chats) and SharePoint (Channel files).<\/span><\/p>\n<p><b>Technical Requirement:<\/b><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">A full-fidelity Teams migration requires professional third-party tooling via Microsoft Graph API (such as PCVITA, SysTools, or BitTitan).<\/span><\/li>\n<\/ul>\n<p><b>The Strategy: <\/b><span style=\"font-weight: 400;\">Migrate Teams in two different streams. Because the Microsoft 365 Migration Orchestrator can now manage 1:1 Teams chats. But it does not support migrating Teams Channels, Tabs, Planner Boards, or Apps.<\/span><\/p>\n<p><strong>Also Check Out: <a href=\"https:\/\/www.pcvita.com\/blog\/export-emails-from-office-365-to-excel.html\">How to Export Emails from Office 365 to Excel?<\/a><\/strong><\/p>\n<div class=\"alert alert-primary\">\n<h2 id=\"office\"><strong>Office 365 Tenant to Tenant Migration: Step-by-Step Process\u00a0<\/strong><\/h2>\n<p><span style=\"font-weight: 400;\">Make certain that every migrating user is assigned a standard Exchange Online license and the Microsoft Cross-Tenant User Data Migration add-on license. Also, confirm that no mailboxes are on Legal Hold. Because this strictly blocks the native migration engine.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">So, here are the straightforward steps to securely migrate mailboxes across Microsoft 365 tenants: <\/span><\/p>\n<h3 id=\"directory\"><strong>#1: Directory Preparation and Identity Mapping\u00a0<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">A successful Office 365 tenant to tenant migration highly depends on precise <\/span><span style=\"font-weight: 400;\">cross-tenant identity mapping. Mapping the source identities to the target environment is undeniably the most critical phase of a cross-tenant migration.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">If these attributes do not match perfectly, your employees will experience major technical issues such as bounced emails and broken reply chains. Resulting in impeding your organization\u2019s daily operations and overall productivity.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">So, connect to Exchange Online PowerShell in the Source Tenant and export the important attributes. To do so, run the given command:<\/span><\/p>\n<div class=\"alert alert-danger\">\n<pre><strong>Get-Mailbox -ResultSize Unlimited | Select-Object ExchangeGUID, ArchiveGUID, LegacyExchangeDN, UserPrincipalName, PrimarySMTPAddress, DisplayName | Export-Csv -Path \"C:\\SourceUsers.csv\" -NoTypeInformation<\/strong><\/pre>\n<\/div>\n<h3 id=\"create\"><strong>#2: Create and Prepare Target MailUsers\u00a0<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">Target tenant design and build the users as MailUser objects is the next step of this robust Microsoft 365 migration guide. In the target tenant, you must create the users as MailUser objects for each migration user.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">You do not have to create standard licensed mailboxes. And then, stamp these target objects with the exact ExchangeGuid and ArchiveGuid from the source.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Additionally, add the source<strong> LegacyExchangeDN<\/strong> as an<strong> X.500 proxy address<\/strong> to preserve internal email reply chains.<\/span><\/p>\n<p><b># Example for a single user mapping:<\/b><\/p>\n<div class=\"alert alert-danger\">\n<pre><strong>Set-MailUser \"user@targetdomain.com\" -ExchangeGuid\u00a0 -ArchiveGuid\u00a0 -EmailAddresses @{Add=\"x500:\"}<\/strong><\/pre>\n<\/div>\n<p><span style=\"font-weight: 400;\">Important Note: Avoid assigning an Exchange Online license to these target users until the migration is actively ready to finalize. Or, Microsoft will provision a net-new empty mailbox to break the sync.\u00a0<\/span><\/p>\n<h3 id=\"register\"><strong>#3: Register the Entra ID Application\u00a0<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">To ensure the data flow securely between the source tenant and destination tenant, establishing an OAuth application is non-negotiable. To do so, follow the given steps:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Log in to the <strong>Microsoft Entra Admin Center<\/strong> (of the target tenant).<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Go to <strong>App Registrations<\/strong> &gt;&gt;<strong> New Registration.<\/strong><\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Name it <strong>\u201cCross-Tenant Migration App\u201d<\/strong>.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Move to<strong> API Permissions<\/strong> &gt;&gt;<strong> Add a permission.<\/strong><\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Find <strong>Office 365 Exchange Online<\/strong> &gt;&gt; <strong>Application Permissions.<\/strong><\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Check <\/span> <span style=\"font-weight: 400;\"><strong>Mailbox.Migration<\/strong> &gt;&gt; click<strong> Add Permissions.<\/strong><\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\"><strong>Important Step:<\/strong> Click <strong>Grant admin consent <\/strong>for (Target Tenant Name).<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Lastly, generate a<strong> Client Secret<\/strong>. And safely document the <strong>Application (Client) ID<\/strong> and <strong>Client Secret<\/strong>. It will be used alongside the Application (Client) ID to authenticate the migration endpoint.<\/span><\/li>\n<\/ul>\n<h3 id=\"grant\"><strong>#4: Grant Source Tenant Consent\u00a0<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">The created application in the target tenant must be authorized by the source environment. To grant the source tenant approval explicitly. In the given URL, replace the variables with your specific IDs and open an incognito window. Make sure to be logged in as the Source Tenant Global Administrator.<\/span><\/p>\n<p><strong>The URL: <\/strong><a href=\"https:\/\/login.microsoftonline.com\/\/adminconsent?client_id=&amp;redirect_uri=https:\/\/office.com\"><span style=\"font-weight: 400;\">https:\/\/login.microsoftonline.com\/\/adminconsent?client_id=&amp;redirect_uri=https:\/\/office.com<\/span><\/a><\/p>\n<p><span style=\"font-weight: 400;\">After constructing the URL, click Accept (on the permissions prompt). This authorizes the target app to read and extract the source mailboxes.\u00a0<\/span><\/p>\n<h3 id=\"configure\"><strong>#5: Configure the Migration Endpoint<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">Once the OAuth is established, build the Migration Endpoint in the target environment. Doing this will create a secure tunnel between the two Exchange organizations. Run the exact script in the target tenant Exchange Online PowerShell:<\/span><\/p>\n<div class=\"alert alert-danger\">\n<pre><strong>$AppId = \"\"\r\n<\/strong><strong>$Secret = ConvertTo-SecureString \"\" -AsPlainText -Force\r\n<\/strong><strong>Credential=New-ObjectSystem.Management.Automation.PSCredential(AppId, $Secret)\r\n<\/strong><strong>New-MigrationEndpoint -Name \"CrossTenantEndpoint\" -RemoteServer outlook.office.com -RemoteTenant \"sourcedomain.onmicrosoft.com\" -Credentials Credential-ExchangeRemoteMove:true -ApplicationId $AppId<\/strong><\/pre>\n<\/div>\n<p><strong>To review the health of the tunnel, use the following command:<\/strong><\/p>\n<div class=\"alert alert-danger\">\n<pre><strong>Test-MigrationServerAvailability -Endpoint \"CrossTenantEndpoint\" -TestMailbox \"user@targetdomain.com\"\u00a0<\/strong><\/pre>\n<\/div>\n<h3 id=\"execute\"><strong>#6: Execute the Initial Sync (Pre-Stage Migration)<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">Make a simple CSV file with a single column header named \u201cEmailAddress\u201d. It must contain the target SMTP addresses of your users. Now, use the created endpoint to start the batch. This batch will clone historical data up to a 95% completion state and pause. Also, it allows users to continue to work smoothly in the source tenant.<\/span><\/p>\n<p><strong>To do so, run the given script:<\/strong><\/p>\n<div class=\"alert alert-danger\">\n<pre><strong>New-MigrationBatch -Name \"M&amp;A_Batch_01\" -SourceEndpoint \"CrossTenantEndpoint\" -CSVData ([System.IO.File]::ReadAllBytes(\"C:\\MigrationBatch.csv\")) -TargetDeliveryDomain \"targetdomain.onmicrosoft.com\" -AutoStart<\/strong><\/pre>\n<\/div>\n<h3 id=\"delta\"><strong>#7: Delta Syncs and DNS Cutover\u00a0<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">Once you\u2019re ready to cut over, update your public DNS records (MX and Autodiscover CNAME)\/ to point to the target Microsoft 365 Tenant. And to trigger the final delta sync, run the following command:<\/span><\/p>\n<div class=\"alert alert-danger\">\n<pre><strong>Complete-MigrationBatch -Identity \"M&amp;A_Batch_01<\/strong><\/pre>\n<\/div>\n<p><span style=\"font-weight: 400;\">When it&#8217;s complete, Microsoft\u2019s orchestration engine will itself transform the target MailUser objects into fully licensed Mailbox objects. And cut the connection with the source environment.<\/span><\/p>\n<\/div>\n<h2 id=\"ultimate\"><strong>The Ultimate Solution For a Fast &amp; Secure Office 365 Tenant to Tenant Migration<\/strong><\/h2>\n<p><span style=\"font-weight: 400;\">Microsoft native tools are advancing, but it still comes with rigid limitations. Especially regarding bulk scaling, advanced data filtering, and comprehensive workload support.\u00a0<\/span><span style=\"font-weight: 400;\">To deal with this, IT experts frequently advocate for a third-party, professional migration tool.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">And currently, the <strong><a href=\"https:\/\/www.pcvita.com\/office365-to-office365.html\">PCVITA Office 365 to Office 365 Migration tool<\/a><\/strong> stands as the industry\u2019s top migration utility. It is specifically designed to bypass the architectural limitations of native Microsoft tools. It promises a high-fidelity and highly automated bridge between Microsoft 365 tenants.<\/span><\/p>\n<p class=\"text-center mr-2\"><a class=\"btn btn-lg btn-md-block text-white\" style=\"background: #28a745; color: #fff !important;\" href=\"https:\/\/systoolskart.com\/download\/SYS2O4E2M\/18\" rel=\"nofollow\"> Download Now<\/a> <a class=\"btn btn-lg btn-md-block text-white\" style=\"background: #ff6800; color: #fff !important;\" href=\"https:\/\/systoolskart.com\/buy\/SYS2O4E2M\/18\" target=\"_blank\" rel=\"noopener noreferrer nofollow\"> Purchase Now<\/a><\/p>\n<div class=\"alert alert-warning\"><strong>In other words, it allows you to safely move everything. From Primary Mailboxes, In-Place Archives, Shared Mailboxes, Public Folders, and SharePoint\/OneDrive Documents<\/strong><\/div>\n<p><strong>Q.1: Can I move dozens of mailboxes simultaneously using PCVITA?<\/strong><\/p>\n<p><span style=\"font-weight: 400;\">Yes, using its advanced Concurrent Migration, you can migrate up to 200 mailboxes simultaneously. Simply bypassing Microsoft&#8217;s strict data throttling.<\/span><\/p>\n<p><b>Q.2: Does it have the ability to migrate only the newly arrived items?<\/b><\/p>\n<p><span style=\"font-weight: 400;\">Yes, it introduces an intelligent Delta Migration feature. This allows you to run an initial pre-stage sync, moving 90% of the historical data a week in advance. And scans the source tenant and migrates only newly arrived emails, calendar invites, and documents.\u00a0<\/span><\/p>\n<p><b>Q.3: Can it re-run the failed items?<\/b><\/p>\n<p><span style=\"font-weight: 400;\">Absolutely yes! Unlike native tools that often fail a batch silently, PCVITA allows you to specifically re-run only the items that failed without duplicating existing data.<\/span><\/p>\n<p><b>Q.4: Does PCVITA provide selective migration?<\/b><\/p>\n<p><span style=\"font-weight: 400;\">Indeed! It integrates Date-based and Category-based filters in this interface. You can use it to migrate only emails and documents created between specific dates. Or exclude complete categories (such as moving Emails and Contacts but leaving Tasks and Calendars behind).<\/span><\/p>\n<p><b>Q.5: Can it fail to map users correctly?<\/b><\/p>\n<p><span style=\"font-weight: 400;\">No, this tool eliminates the manual GUID mapping and offers automatic user mapping. You can use the Fetch users feature to automatically fetch the Active Directory list from the source environment. Also, <\/span> <span style=\"font-weight: 400;\">you can upload hard-coded CSV mapping files for intense rebranding scenarios (such as target UPN differs from the source).<\/span><\/p>\n<p><b>Q.6: Does this migration tool preserve metadata and permissions?<\/b><\/p>\n<p><span style=\"font-weight: 400;\">Yes, it keeps the crucial metadata intact. Including the Read, Write, and Comment permissions on migrated documents. <\/span><\/p>\n<p><span style=\"font-weight: 400;\">So, stop replying to the complex PowerShell scripts. And choose the PCVITA ultimate tool for a secure Office 365 tenant to tenant migration in 2026.<\/span><\/p>\n<p><strong>Must Explore: <a href=\"https:\/\/www.pcvita.com\/blog\/migrate-mail-from-cpanel-to-office-365.html\">Learn to Migrate Mail from cPanel to Office 365 Step by Step<\/a><\/strong><\/p>\n<h3><strong>Steps to Use PCVITA Software for Office 365 Tenant to Tenant Migration<\/strong><\/h3>\n<p><b>Step 1.<\/b><span style=\"font-weight: 400;\"> Run the software and select Office 365 as a source and destination from the main screen.<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter\" src=\"https:\/\/www.pcvita.com\/blog\/wp-content\/uploads\/2021\/08\/main-screen-1024x547.png\" alt=\"select-sources\" width=\"613\" height=\"327\" \/><\/p>\n<p><b>Step 2.<\/b><span style=\"font-weight: 400;\"> Select items that you want to migrate from the Workload selection, such as emails, contacts, calendars, tasks, and documents. Including SharePoint Sites, Teams, and Groups. You can also use the Date filter option for selective data transfer. Also, enable the <\/span><b>Migrate documents permission<\/b><span style=\"font-weight: 400;\">. <\/span><b>Use the group mapping option<\/b><span style=\"font-weight: 400;\"> for bulk user migration. Select the option according to your requirements. Then click on <strong>Next<\/strong>.<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter\" src=\"https:\/\/www.pcvita.com\/blog\/wp-content\/uploads\/2020\/10\/3-1024x547.png\" width=\"604\" height=\"323\" \/><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter\" src=\"https:\/\/www.systoolsgroup.com\/img\/how-it-work\/sharepoint-migrator\/v6.3\/sharepoint-to-sharepoint-3.webp\" alt=\"document library\" width=\"606\" height=\"340\" \/><\/p>\n<p><b>Step 3.<\/b><span style=\"font-weight: 400;\"> Now, enter the source <strong>Admin Email<\/strong> and <strong>Application ID<\/strong>, then click the <strong>Validate<\/strong> button to validate permissions in order to perform Office 365 tenant to tenant migration step by step.<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter\" src=\"https:\/\/www.pcvita.com\/blog\/wp-content\/uploads\/2020\/10\/5-1024x546.png\" width=\"619\" height=\"330\" \/><\/p>\n<p><b>Step 4.<\/b><span style=\"font-weight: 400;\"> Once the software validates the permissions. Then, Click on <strong>Next.<\/strong><\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter\" src=\"https:\/\/www.pcvita.com\/blog\/wp-content\/uploads\/2020\/10\/6-1024x547.png\" width=\"631\" height=\"337\" \/><\/p>\n<p><b>Step 5.<\/b><span style=\"font-weight: 400;\"> Now, enter the destination <strong>Admin ID and Application ID<\/strong>, then click on <strong>Next.<\/strong><\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter\" src=\"https:\/\/www.pcvita.com\/blog\/wp-content\/uploads\/2020\/10\/7-1024x576.png\" width=\"627\" height=\"353\" \/><\/p>\n<p><b>Step 6.<\/b><span style=\"font-weight: 400;\"> After the permission validation, click on the <strong>Next<\/strong> button.<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter\" src=\"https:\/\/www.pcvita.com\/blog\/wp-content\/uploads\/2020\/10\/8-2-1024x546.png\" width=\"627\" height=\"334\" \/><\/p>\n<p><b>Step 7.<\/b><span style=\"font-weight: 400;\"> We have to create a mapping between Office 365 source users and destination users, to do this, the tool provides three options \u2013 Fetch users, Import users, and Download template. Select any of these options to perform tenant to tenant migration in Office 365.<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter\" src=\"https:\/\/www.pcvita.com\/blog\/wp-content\/uploads\/2020\/10\/9-1024x547.png\" width=\"630\" height=\"337\" \/><\/p>\n<p><b>Step 8.<\/b><span style=\"font-weight: 400;\"> Now, mapping is successfully done. Click on the <strong>Validate<\/strong> button and proceed to the next step.<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter\" src=\"https:\/\/www.pcvita.com\/blog\/wp-content\/uploads\/2020\/10\/16-1024x546.png\" width=\"649\" height=\"346\" \/><\/p>\n<p><b>Step 9.<\/b><span style=\"font-weight: 400;\"> After permission validation, click on the <strong>Start Migration<\/strong> button to perform tenant to tenant migration in O365 step by step.<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter\" src=\"https:\/\/www.pcvita.com\/blog\/wp-content\/uploads\/2020\/10\/18-1024x547.png\" width=\"672\" height=\"359\" \/><\/p>\n<p><span style=\"font-weight: 400;\">As migration is completed, you can log in to the destination Office 365 tenant to access old tenant data.<\/span><\/p>\n<h2 id=\"post\"><strong>Post Migration Checklist and Testing<\/strong><\/h2>\n<p><span style=\"font-weight: 400;\">Do you know what confirms a successful Office 365 tenant to tenant migration? <strong>A Post-Migration Checklist.<\/strong><\/span><\/p>\n<p><span style=\"font-weight: 400;\">The respective phase holds utter significance because this is where IT administrators are required to manually rebuild the architectural dependencies. Ensuring that it does not traverse the Microsoft 365 cross-tenant migration tunnel.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">And if these configurations are not addressed accurately, users in your organisation will encounter broken reply chains, missing calendar delegations, and Outlook profile corruption.\u00a0<\/span><\/p>\n<h3><strong>#1: Migration Verification and Identity True-Up\u00a0<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">Verifying the migration is the first Office 365 tenant to tenant migration step. When the migration batch displays the Complete status, the Microsoft Orchestration engine cuts the connection to the source tenant. It automatically converts the target MailUser object into a fully licensed Mailbox. To audit the cross-tenant migration:\u00a0<\/span><\/p>\n<p><b>Validate Move Request Success:<\/b><\/p>\n<p><span style=\"font-weight: 400;\">It is critical to confirm that the move request is completed without hidden data loss or skipped items. To identify success, run the following Exchange Online PowerShell command in the target tenant:<\/span><\/p>\n<pre><strong>Get-MoveRequest -BatchName \"CTM-Phase1\" | Get-MoveRequestStatistics -DiagnosticInfo \"verbose,showfailures\" | Format-List DisplayName, Status, PercentComplete, BadItemsEncountered, LargeItemsEncountered<\/strong><\/pre>\n<p><span style=\"font-weight: 400;\">Also, you have to manually review the missing corrupt data if any mailbox has a BadItemsEncountered count higher than your approved threshold (usually 0-10).<\/span><\/p>\n<p><b>License Reassignment<\/b><\/p>\n<p><span style=\"font-weight: 400;\">Whether it&#8217;s on-premises to cloud or cloud to cloud migration, migrating target users required the Cross-Tenant User Data Migration add-on license. However, you can remove this add-on to reclaim costs once the cutover is completed. It will strip the respective add-on and leave only the standard Microsoft 365 E3\/E5 or Exchange Online Plan 2 license active. <\/span><\/p>\n<h3><strong>#2: Mail Routing and DNS Validation<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">Email routing is probably the most visible part of a failure post-migration. So, you have to validate that external, internal, and legacy emails route correctly as MX Records are pointed to the target tenant.<\/span><\/p>\n<p><b>Check Legacy X.500 Reply-ability:<\/b><\/p>\n<p><span style=\"font-weight: 400;\">To ensure the users in your organization do not receive a 5.1.1 NDR (Non-Delivery Report), test legacy X.500 Reply-ability. Usually, this issue occurs when the migrator or IT admin fails to map in the pre-migration phase, so that Outlook uses the LegacyExchangeDn attribute instead of the standard SMTP address. Resulting in triggering NDR when users reply to old internal emails.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">To fix this, send a test email by replying to a thread created before the migration window in the source tenant.<\/span><\/p>\n<p><b>DNS Propagation Check:<\/b><\/p>\n<p><span style=\"font-weight: 400;\">Confirm that your updated DNS records have completely propagated to the new tenant. To check that, open a command prompt and query the domain:<\/span><\/p>\n<pre><strong>nslookup -type=mx targetdomain.com\r\n<\/strong><strong>nslookup -type=txt targetdomain.com<\/strong><\/pre>\n<p><span style=\"font-weight: 400;\">Also, make sure that the TXT records include the SPF string (v=spf1 include:spf.protection.outlook.com -all). It prevents outbound emails from being tagged as spam by external servers.<\/span><\/p>\n<h3><strong>#3: Permission and Delegation Re-Stamping<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">As an IT administrator, you are required to manually restamp all the Shared Mailbox access, calendar delegations, and Send-As permissions. Because the native Microsoft cross-tenant migration engine does not migrate mail store permissions. Execute the following scripts in PowerShell:<\/span><\/p>\n<p><b>#Re-apply Full Access Permissions:<\/b><\/p>\n<pre><strong>Add-RecipientPermission -Identity \"sharedmailbox@targetdomain.com\" -Trustee \"user@targetdomain.com\" -AccessRights SendAs<\/strong><\/pre>\n<p><b>#Re-apply Send-as Permissions:<\/b><\/p>\n<pre><strong>Add-RecipientPermission -Identity \"sharedmailbox@targetdomain.com\" -Trustee \"user@targetdomain.com\" -AccessRights SendAs<\/strong><\/pre>\n<p><b>#Re-apply Send on Behalf Of:<\/b><\/p>\n<pre><strong>Set-Mailbox -Identity \"executive@targetdomain.com\" -GrantSendOnBehalfTo \"assistant@targetdomain.com\"<\/strong><\/pre>\n<h3><strong>#4: Security and Compliance Alignment<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">If certain mailboxes are under an Office 365 Litigation Hold or Purview Retention Policy, they are likely excluded. Or have their holds temporarily bypassed to let the native migration proceed (as active holds restrict cross-tenant moves).<\/span><\/p>\n<p><span style=\"font-weight: 400;\">So, if a user is part of an active litigation, you must re-apply the hold in the target environment. For that, use this script in the target tenant Exchange Online PowerShell: <\/span><\/p>\n<pre><strong>Set-Mailbox \"user@targetdomain.com\" -LitigationHoldEnabled $true -LitigationHoldDuration Unlimited<\/strong><\/pre>\n<p><b>Also,<\/b><span style=\"font-weight: 400;\"> if device management is also being migrated, instruct users to unjoin their Windows devices from the source Entra ID and re-enroll in the target Entra ID. And make sure your Conditional Access Policies (such as forcing MFA for off-network logins) are enabled for the newly populated user groups.<\/span><\/p>\n<h3><strong>#5: End-User Client Reconfiguration\u00a0<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">Now that the tenant identity (GUID) has fundamentally transformed, the native Microsoft applications will fail to connect. Until they are removed from their old cache and reconfigured.<\/span><\/p>\n<p><b>Outlook Profile Re-creation:<\/b><\/p>\n<p><span style=\"font-weight: 400;\">The newly created tenant can\u2019t be identified by Outlook Desktop clients. Hence, you must force Outlook to drop the old Autodiscover cache and rebuild the profile. To initiate this, Instruct users to:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Open the <strong>Windows Control Panel.<\/strong><\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Go to<strong> Mail (Microsoft Outlook).<\/strong><\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Click <strong>Show Profiles<\/strong><\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Create a <strong>net-new profile.<\/strong><\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Additionally, to force this for enterprise environments, push the following\u00a0 Registry Key using Intune or Group Policy: <strong>HKEY_CURRENT_USER\\Software\\Microsoft\\Office\\16.0\\Outlook\\Profiles<\/strong><\/span><\/p>\n<p><b>Remove Microsoft Teams Cache:\u00a0<\/b><\/p>\n<p><span style=\"font-weight: 400;\">Users are often stuck in a login loop when trying to authenticate the old, now-decommissioned source tenant in Teams. To prevent this, direct the users to sign out of Teams completely. Clean the modern cache by deleting the contents of: %userprofile%\\appdata\\local\\packages\\msteams_8wekyb3d8bbwe. Lastly, relaunch and authenticate with the target environment credentials.<\/span><\/p>\n<h3><strong>#6: Source Tenant Decommissioning<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">Decommissioning the source environment is the critical step for the organization. This ensures zero security vulnerabilities and duplicate billing post-migration.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">So, once the mail is flowing perfectly, permissions are restamped, and users are successfully working in the target tenant, interpret this as a signal to decommission. To execute this successfully:<\/span><b><\/b><\/p>\n<ul>\n<li aria-level=\"1\"><b>Remove the Custom Domain:<\/b><span style=\"font-weight: 400;\"> Extract the custom domain (@company.com) from all remaining objects in the source tenant. Including resetting them to the default *.onmicrosoft.com routing address.<\/span><\/li>\n<li aria-level=\"1\"><b>Delete the Domain: <\/b><span style=\"font-weight: 400;\">Remove the domain completely from the Source Microsoft 365 Admin Center\u00a0<\/span><\/li>\n<li aria-level=\"1\"><b>Cancel Subscriptions: <\/b><span style=\"font-weight: 400;\">Cancel all source tenant licenses and start the data deletion process with Microsoft.<\/span><\/li>\n<\/ul>\n<h2 id=\"common\"><strong>Common Challenges and Expert Solutions<\/strong><\/h2>\n<p><span style=\"font-weight: 400;\">It is a common phenomenon for IT administrators to encounter high-impact migration challenges during a Microsoft 365 cross-tenant migration -from Microsoft throttling limits, broken calendar visibility, and strict compliance barriers.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">So, let\u2019s check these issues in detail and the expert solutions to resolve them for a secure Microsoft 365 tenant to tenant migration.<\/span><\/p>\n<h3><strong>#1: Microsoft Data Throttling (EWS &amp; Graph API Limits)<\/strong><b><br \/>\n<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">Microsoft Throttling is a system-protection measure that deliberately limits the number of incoming API requests an app or user can make in a specific timeframe. Including connections and compute operations. This security framework is used by Microsoft to safeguard server health.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">So when massive mailboxes or SharePoint sites are migrated from one tenant to another, Microsoft\u2019s backend detects the jump in bandwidth. Resulting in throttling the migration service. This eventually slows down migration batches or fails completely with 429 Too Many Requests or 503 Server Too Busy errors.<\/span><\/p>\n<p><b>The Expert Solution: <\/b><span style=\"font-weight: 400;\">Request a temporary lift of Exchange Web Services (EWS) throttling limits. To do so, you require a specific diagnostic workflow located in the Microsoft 365 Admin Center.<\/span><\/p>\n<p><b>Important Note:<\/b><span style=\"font-weight: 400;\"> When performing an Office 365 tenant to tenant migration, request it on both the source and target tenants.\u00a0<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Log in to<strong> Microsoft 365 Admin Center (as a Global Administrator).<\/strong><\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Click the<strong> Help &amp; Support widget<\/strong> (green question mark) in the bottom right corner.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Type the given diagnostic phrase in the search box: <strong>Increase EWS Throttling Policy<\/strong><\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Run the<strong> automated Throttling Policy.<\/strong><\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">In the form,<strong> select the duration for the exception<\/strong> (usually 30, 60, or 90 days) &gt;&gt; <strong>Submit<\/strong>.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Lastly,<strong> wait for 15 mins for the grant approval<\/strong>. Once activated, it will allow the migration tools to function at maximum throughput.<\/span><\/li>\n<\/ul>\n<h3><strong>#2: Broken Cross-Tenant Free\/Busy Calendar Visibility<\/strong><b><br \/>\n<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">Broken cross-tenant free\/busy calendar visibility is a common challenge that IT admins come across when moving Office 365 to a new tenant. This issue typically occurs during the coexistence phase (the week when some users are in the target tenant and the rest in the source environment). Basically, users lose the ability to see colleagues\u2019 availability (Free\/Busy status) when scheduling messages.\u00a0<\/span><\/p>\n<p><b>The Expert Solution: <\/b><span style=\"font-weight: 400;\">Establish a two-way Exchange Organization Relationship (using the Exchange Online PowerShell). Doing this will safely bridge the free\/busy query feature across the two disparate tenants. So, use the given configuration in both tenants and swap the remote domain variables accordingly:<\/span><\/p>\n<p><strong># Create the relationship pointing to the external tenant<\/strong><\/p>\n<pre><strong>New-OrganizationRelationship -Name \"CrossTenant Coexistence\" -DomainNames \"targetdomain.com\" -FreeBusyAccessEnabled $true -FreeBusyAccessLevel LimitedDetails<\/strong><\/pre>\n<p><strong># Verify the relationship is active<\/strong><\/p>\n<pre><strong>Get-OrganizationRelationship | Format-List Name, FreeBusyAccessEnabled, FreeBusyAccessLevel<\/strong><\/pre>\n<p><span style=\"font-weight: 400;\">The setting &#8211;<strong>FreeBusyAccessLevel LimitedDetails<\/strong> will make sure that users can see the time, subject, and location of meetings. It clones the internal functionality without surfacing full meeting descriptions.<\/span><\/p>\n<h3><strong>#3: Legal Holds Blocking Mailbox Migrations<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">If certain mailboxes and OneDrive accounts are subjected to an active<strong><a href=\"https:\/\/www.systoolsgroup.com\/updates\/litigation-hold-office-365\/\"> Office 365 Litigation Hold<\/a> <\/strong>or Purview Retention Policy, the native Microsoft Migration Orchestrator will completely block them from migrating to another tenant. The batch will immediately fail for those particular users.<\/span><\/p>\n<p><b>The Expert Solution: <\/b><span style=\"font-weight: 400;\">Partner with the legal\/compliance department and temporarily suspend the hold. Migrate the user and immediately restamp the hold in the target tenant. Keep in mind, you cannot force a migration through an active legal hold using native tools.<\/span><\/p>\n<p><strong>#Identify the Hold in the Source Tenant:<\/strong><\/p>\n<pre><strong>Get-Mailbox -Identity \"user@sourcedomain.com\" | Select-Object LitigationHoldEnabled, InPlaceHolds<\/strong><\/pre>\n<p><strong>Remove the Hold (Source):<\/strong><\/p>\n<pre><strong>Set-Mailbox -Identity \"user@sourcedomain.com\" -LitigationHoldEnabled $false<\/strong><\/pre>\n<p><span style=\"font-weight: 400;\">Next, allow the mailbox to sync and finalize to the target tenant. And re-apply the Hold (Target)immediately upon cutover to maintain compliance. To do so, run the given command:<\/span><\/p>\n<pre><strong>Set-Mailbox -Identity \"user@targetdomain.com\" -LitigationHoldEnabled $true -LitigationHoldDuration Unlimited<\/strong><b>\r\n<\/b><\/pre>\n<h3><strong>#4: Orphaned Permissions and Unresolved SIDs<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">Do you know that if users are not perfectly mapped during the initial identity synchronization, they can lose access to shared files? Yes! This is because when moving SharePoint sites and OneDrive files, file permissions (who has access to a specific folder) are mapped using the user\u2019s Unique ID.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">And when a user fails to map correctly during the initial synchronisation, they will lose access to shared files. And the file permissions will appear as a raw, unresolved SID (a string of numbers) instead of a username.<\/span><\/p>\n<p><b>The Expert Solution:<\/b><span style=\"font-weight: 400;\"> Avoid depending on UPNs (User Principal Names) to map file permissions. Because UPNs frequently change during rebranding migrations. Use Cross-Tenant Identity Mapping (CITM) and confirm that the target Entra ID objects are stamped with the source user\u2019s exact ObjectGuid.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Additionally, when executing a third-party tool (such as PCVITA, SysTools, or BitTitan) for Office 365 cross-tenant migration, always upload a hard-coded CSV mapping file before initiating a SharePoint or OneDrive data pass. The respective CSV file must link the source <\/span><a href=\"mailto:user@old.com\"><span style=\"font-weight: 400;\">user@old.com<\/span><\/a><span style=\"font-weight: 400;\"> to the target <\/span><a href=\"mailto:user@new.com\"><span style=\"font-weight: 400;\">user@new.com<\/span><\/a><span style=\"font-weight: 400;\">.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">And if permissions break post-migration, simply force a Delta Pass using the hard-coded identity map to overwrite the broken SIDs.<\/span><\/p>\n<h2 id=\"final\"><strong>Final Words<\/strong><\/h2>\n<p><span style=\"font-weight: 400;\">Office 365 migration between tenants can be pretty tedious work if we use the conventional manual approach. Not everyone has enough technical knowledge to execute PowerShell scripts to perform the same. However, it can become an easy task if we use the right approach for it.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Hence, understanding the challenges faced by users, we have come up with a smart solution to perform data migration easily in O365. Using the above-mentioned tool, one can easily perform Office 365 tenant to tenant migration step by step, with 100% data security and integrity throughout the process.<\/span><\/p>\n<p><strong>People Also Find Helpful:<\/strong><\/p>\n<ul>\n<li><strong><a href=\"https:\/\/www.pcvita.com\/blog\/how-to-export-office-365-user-list.html\">How to Export Office 365 User List? \u2013 Simple Methods Revealed<\/a><\/strong><\/li>\n<li><strong><a href=\"https:\/\/www.pcvita.com\/blog\/migrate-public-folders-to-office-365.html\">Migrate Public Folders to Office 365 Using the Best Solution<\/a><\/strong><\/li>\n<li><strong><a href=\"https:\/\/www.pcvita.com\/blog\/copy-email-from-office-365-to-desktop.html\">How to Save Email from Office 365 Webmail to Desktop? Step-By-Step Guide<\/a><\/strong><\/li>\n<li><strong><a href=\"https:\/\/www.pcvita.com\/blog\/migrate-mailboxes-from-rackspace-to-office-365.html\">How to Migrate from Rackspace to Office 365 (Microsoft 365)?<\/a><\/strong><\/li>\n<li><strong><a href=\"https:\/\/www.pcvita.com\/export\/office-365-mailbox-to-pst\/\">Learn How to Export Office 365 Mailbox to PST Using Top 4 Solutions<\/a><\/strong><\/li>\n<\/ul>\n<h2 id=\"faqs\"><strong>FAQs (Frequently Asked Questions)<\/strong><\/h2>\n<p><b>Q.1: Does Microsoft have a native tenant-to-tenant migration tool?\u00a0<\/b><\/p>\n<p><span style=\"font-weight: 400;\">Yes, Microsoft does provide a built-in Office 365 tenant to tenant migration tool called Microsoft Orchestrator. It can migrate Exchange mailboxes, OneDrive, and Teams chats. However, this native tool mandates a Cross-Tenant User Data Migration add-on license. It does not support moving SharePoint sites or Teams channels.<\/span><\/p>\n<p><b>Q.2: How long does a tenant-to-tenant migration take?\u00a0<\/b><\/p>\n<p><span style=\"font-weight: 400;\">It entirely depends on the data volume. Typically, a Microsoft 365 tenant to tenant migration takes between 3 and 9 months. However, the actual data transfer varies. For example, migrating a 50GB mailbox takes roughly 1 to 2 days (under normal Microsoft throttling limits).<\/span><\/p>\n<p><b>Q.3: What blocks a mailbox from migrating in Office 365?\u00a0<\/b><\/p>\n<p><span style=\"font-weight: 400;\">Mailboxes subjected to any type of Legal Hold or active Retention Policy block a mailbox from migrating in Office365. So, before migrating one Office 365 tenant to another, remediate the hold (with your legal department).<\/span><\/p>\n<p><b>Q.4: Do SharePoint sites and Teams channels move automatically?\u00a0<\/b><\/p>\n<p><span style=\"font-weight: 400;\">Unfortunately, no! The SharePoint sites and Teams channels don&#8217;t move automatically and stay in the source tenant. Because the native tools handle individual OneDrive files and 1:1 Teams chats.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>In this 2026 Office 365 tenant to tenant migration step-by-step guide, you will learn about: Types of Microsoft 365 migrations. <\/p>\n","protected":false},"author":16,"featured_media":7867,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[283],"tags":[],"class_list":["post-7867","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-office-365"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Tenant to Tenant Migration: Step-by-Step Guide 2026<\/title>\n<meta name=\"description\" content=\"Learn how to perform a secure tenant-to-tenant migration step by step in 2026 in this all-encompassing guide.\" \/>\n<meta name=\"robots\" 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My true passion lies in providing valuable insights and simplifying complicated technicalities, enhancing user understanding and confidence.","sameAs":["https:\/\/www.linkedin.com\/in\/ashwani-tiwari\/","https:\/\/www.pcvita.com\/assets\/author\/ashwani.png"],"url":"https:\/\/www.pcvita.com\/blog\/author\/ashwani"}]}},"_links":{"self":[{"href":"https:\/\/www.pcvita.com\/blog\/wp-json\/wp\/v2\/posts\/7867","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.pcvita.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.pcvita.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.pcvita.com\/blog\/wp-json\/wp\/v2\/users\/16"}],"replies":[{"embeddable":true,"href":"https:\/\/www.pcvita.com\/blog\/wp-json\/wp\/v2\/comments?post=7867"}],"version-history":[{"count":0,"href":"https:\/\/www.pcvita.com\/blog\/wp-json\/wp\/v2\/posts\/7867\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.pcvita.com\/blog\/wp-json\/wp\/v2\/posts\/7867"}],"wp:attachment":[{"href":"https:\/\/www.pcvita.com\/blog\/wp-json\/wp\/v2\/media?parent=7867"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.pcvita.com\/blog\/wp-json\/wp\/v2\/categories?post=7867"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.pcvita.com\/blog\/wp-json\/wp\/v2\/tags?post=7867"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}