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PCVITA software to upload offline OST files to Office 365 accounts
Import OST to Office 365 Account
PCVITA OST to Office 365 Importer uploads OST files to Office 365 mailboxes with emails, attachments, calendars, contacts and tasks in place. Load one OST file or search your drives for many, check every item in the preview and set a date range. Admin impersonation fills several user mailboxes in one job and a CSV file lists the destination accounts. Corrupt files open through the Advance scan and S/MIME or OpenPGP encryption comes off with your key.
- Input
- OST and Outlook.bak files, healthy or corrupt
- Output
- Office 365 user mailboxes
- Items
- Emails, contacts, calendar and tasks
- Needs
- Windows PC with .NET Framework 4.5
Search File locates OST files on your drives, 8 preview views check your mail and CSV mode fills many mailboxes at once. See all features. Prefer a local file for Outlook? Open the OST to PST Converter page.
OST to Office 365 Import at a Glance
Your offline OST file goes in and Office 365 mailboxes fill up. Folders stay in order and attachments stay with their emails.
Your OST File
Outlook 2000 to Outlook 2019 data
- Corrupt files and Outlook.bak copies
- IMAP, Exchange and Hotmail OST files
- One file or many in one job
PCVITA OST to Office 365 Importer
Installs on your Windows PC
- Quick scan or Advance scan
- Preview in 8 views
- S/MIME and OpenPGP removal
Office 365 Mailboxes
One account or many from a CSV file
- Emails, contacts, calendar and tasks
- Attachments stay with their emails
- Folder hierarchy kept on request
- 1LoadOpen one OST file or search a drive for more.
- 2CheckSet Quick or Advance scan and review your mail.
- 3UploadSelect Office 365, validate the mailbox and export.
Import OST to Office 365 in 6 Steps
Six screens take you from install to a filled mailbox. Tap a step tab for its screen or open the Software Guide for every screen in order.
Step 1. Launch the Importer and Click Add File
Install PCVITA OST to Office 365 Importer on your Windows PC and open it from the Start menu. Click Add File on the main screen to start the load.
Step 2. Select File or Search File for Your OST
Select File opens a browse window for a single OST file or the BAK file that ScanOST made. Search File checks one selected drive or all drives and lists every OST and BAK file found there.
Step 3. Set the Scan Mode
Quick scans a file in fair shape. Advance handles a highly corrupted file on 64 bit Windows. Click Add to begin. When scanning ends, answer Yes in the dialog if you want the scan report saved.
Step 4. Preview Folders and Emails
Folders in bold hold data and the others are empty. Select a folder on the left to see its emails on the right. Eight views cover Normal Mail, Hex, Properties, Message Header, MIME, HTML, RTF and Attachments.
Step 5. Select Office 365 and Set Admin Impersonation
Select the Office 365 radio button and open Advanced Settings. Under User Account Impersonation enter the admin SMTP address and password and click Save. For a single mailbox you can type the username and password in User Validation and click Validate.
Step 6. Name the Destination Mailbox and Export
Select Maintain Folder Hierarchy or untick it to skip empty folders and click Next. Enter the destination mailbox name and PCVITA validates it at once. Click Export to start. Your export report lists the success and fail counts and saves as a CSV file.
Go through these steps with your own OST file before you buy.
Features to Upload OST Data to Office 365 Accounts
Tools in PCVITA OST to Office 365 Importer, grouped by the job they do for your offline Outlook data.
Uploads OST Items to Office 365 Mailboxes
Mail, calendar, contacts and tasks move from the OST file into a cloud mailbox you name.
Destination Mailbox Check
Type the target mailbox name and PCVITA validates it at once. Green ticks show before you click Export.
Admin Impersonation
Save the admin SMTP address and password under User Account Impersonation to upload into other users' mailboxes.
Folder Hierarchy Option
Keep the OST folder tree in Office 365 or untick it and skip empty folders with Don't Export Empty Folders.
Attachments Stay Put
Emails reach the mailbox with their attachments and properties.
Works With or Without Outlook
Data comes straight from the OST file, so the job does not need Outlook open on your PC.
Fills Many Mailboxes From One CSV File
Batch jobs skip the account by account typing and upload several OST files in one go.
Provide Accounts From a CSV
Select the CSV mode and browse to a file that lists the destination Office 365 accounts.
Automatic CSV Generation
Let PCVITA write the CSV for you, save it and add the mailbox credentials in a spreadsheet.
Credentials Validated
The software checks every account and shows a green tick before the export starts.
Export Report as CSV
Success and fail counts appear after the job and the report saves to the folder you choose.
Loads and Scans OST Files Before the Upload
Healthy and damaged OST files open the same way and encrypted emails open with your key.
Single or Batch OST Files
Load one file by hand or have Search File list OST and BAK files from a chosen drive or from all drives.
Two Scan Modes
Quick covers lighter damage while Advance searches deep inside badly corrupted files.
Outlook.bak Files Open Too
Select File accepts the BAK file that ScanOST created.
S/MIME and OpenPGP Removal
Supply the certificate with its password or the private key with its password and locked emails open in plain form.
No File Size Limit
OST files of any size load without a size cap.
Filters and Previews Your OST Data First
Check the mailbox on screen and decide what travels to Office 365.
8 Preview Views
Switch between Normal Mail, Hex, Properties, Message Header, MIME, HTML, RTF and Attachments.
Date Filter
Enter a date range in General Settings and only emails inside it upload.
Category Filter
Tick Mails, Calendars, Tasks and other item types in Advanced Settings and leave the rest behind.
Export Selected Items
Tick the folders or emails you need and upload only those.
Try every option on your own OST file during the free demo.
Why Microsoft Tools Alone Fall Short for OST Uploads
Four facts from official Microsoft pages and what PCVITA adds to them.
- 1
OST Files Copy Your Exchange Items
Microsoft says an Outlook Data File (.ost) goes with an Exchange account and is always a copy of items saved on a mail server. PCVITA opens that copy from your drive and uploads its items to Office 365.
- 2
Network Upload Describes PST Files
Microsoft documents network upload with the Import service for bulk import of PST files to user mailboxes. PCVITA starts from the OST file, so your data goes in without a PST step.
- 3
Microsoft Advises 20 GB per PST File
Microsoft states that PST files you upload should be no larger than 20 GB and bigger files can slow the import. PCVITA sets no size limit on the OST file you add.
- 4
Impersonation Needs an Admin Role
Microsoft says only accounts that hold the ApplicationImpersonation role from an Exchange administrator can use impersonation. Your admin account must be impersonated before PCVITA uploads into other mailboxes. You enter its details in Advanced Settings.
Prepare Your OST File and Admin Account First
Seven quick checks save time later. Work down the list, then open the software.
- Copy your OST file. Import from the copy and the original stays untouched.
- Note where the file sits. Lost the path? Search File locates OST and BAK files on a drive.
- Prepare the Office 365 admin account. It needs an assigned license (the Software Guide names E3) and must be impersonated when you upload into other mailboxes.
- Check your PC. Plan for 100 MB of free disk space, 500 MB RAM (2 GB recommended) and a 1 GHz processor (2.4 GHz recommended).
- Add Microsoft .NET Framework 4.5 or above ahead of your first launch.
- Right click the shortcut and select Run as Administrator on Windows 10, 8.1, 8, 7 and Vista.
- Try the free demo on your file. Download the demo and see how your items land in Office 365.
Hardware lines repeat in the Specifications table. Microsoft facts link to the Sources list.
OST to Office 365 Importer Price and Demo Limits
Start with the free demo and buy one licence when your test looks right. Demo edition stops at 25 items per folder while full edition uploads every item.
Demo Edition
Free
Try the upload flow on your own OST file
- Office 365 export25 items per folder
- PreviewAll items
- LicenceNot needed
Version 8.0, 35.4 MB, Windows
Full Edition
$49 one licence
Upload every OST item with no folder cap
- Office 365 exportAll items
- OST filesSingle or batch
- DeliverySent by email
30 Days Money Back*, Safe & Secure checkout
Included in the full edition The demo stops at 25 items per folder
- Upload All OST Items to Office 365
- Single and Batch OST Files
- Admin Impersonation Settings
- CSV Mode for Many Mailboxes
- Quick and Advance Scan
- S/MIME and OpenPGP Removal
- Date and Category Filters
- Export Report as CSV
OST to Office 365 Importer Specifications
Version, system needs and upload details in two tables.
| Version | 8.0 |
|---|---|
| File size | 35.4 MB |
| Windows versions | Windows 10, 8.1, 8, 7 and Vista (32 and 64 bit), plus Windows Server 2003, 2008 and 2012 |
| Launch | Select Run as Administrator on Windows 10, 8.1, 8, 7 and Vista |
| Framework | Microsoft .NET Framework 4.5 or above |
| Hardware | 1 GHz processor (2.4 GHz recommended), 500 MB RAM (2 GB recommended), 100 MB free hard disk space |
| Free demo limit | 25 items per folder |
| Input files | Single or multiple OST files and the BAK file from ScanOST |
|---|---|
| Outlook versions | Outlook 2019, 2016, 2013, 2010, 2007, 2003 and 2000 (32 and 64 bit) |
| Office 365 plans | Enterprise E1, E3 and E5, Business Premium, Essentials, Exchange Online Plan 1 and Plan 2, Office 365 A1, A3, A5 and F1 |
| Admin account | Assigned license and impersonation when you upload into other mailboxes |
| Scan modes | Quick scan and Advance scan (highly corrupted files, 64 bit Windows supported) |
| Encrypted emails | S/MIME certificate and OpenPGP key encryption removed during the job |
| Filters | Date range plus item categories |
Microsoft PST Import vs PCVITA OST Importer
Microsoft documents OST files, PST network upload and impersonation. Compare those facts with PCVITA software in the table.
| Point | Microsoft Network Upload | PCVITA Importer |
|---|---|---|
| Source file | PST files | The OST file itself |
| Upload route | PST files go to temporary cloud storage and the Import service copies them to mailboxes | Direct export to the Office 365 mailbox you name |
| File size | PST files should stay under 20 GB | No size limit on the OST file |
| Mailbox mapping | CSV mapping file with up to 500 rows | CSV mode or one validated mailbox |
| Damaged file | The page does not cover it | Quick and Advance scan modes |
| Selection | Import of full PST files | Ticked items, date range and categories |
OST facts come from Open or import items from an offline Outlook Data File (Microsoft Support). Network upload facts come from Use network upload to import PST files (Microsoft Learn). Impersonation facts come from Impersonation and EWS in Exchange (Microsoft Learn). PCVITA facts come from the Features and Specifications sections.
Sources for OST and Office 365 Facts Official pages behind the facts on this page
- Microsoft SupportOpen or import items from an offline Outlook Data File (.ost)
- Microsoft LearnUse network upload to import PST files to Microsoft 365
- Microsoft LearnImpersonation and EWS in Exchange
OST to Office 365 Import Questions Answered
Answers to what users ask before and during an OST upload, sorted by topic.
Working and Limits What the importer does during the job
How do I import OST to Office 365 with PCVITA software?
Six steps import an OST file to Office 365.
- Step 1. Open PCVITA OST to Office 365 Importer and click Add File.
- Step 2. Load your OST file with Select File or Search File.
- Step 3. Set the Quick or Advance mode and click Add.
- Step 4. Review the folders and emails in the preview.
- Step 5. Select Office 365 and save the admin details in Advanced Settings.
- Step 6. Enter the destination mailbox and click Export.
Can I upload multiple OST files to Office 365 at once?
Yes. Load several files by hand or have Search File list the OST and BAK files on a drive. CSV mode then maps your destination accounts so PCVITA uploads the batch in one job.
Can I import an OST file to Office 365 without Outlook?
Yes. PCVITA extracts the data from the OST file, so the upload works with or without Outlook on your PC.
Does the importer keep attachments and folders?
Yes. Attachments stay with their emails in the mailbox. Select Maintain Folder Hierarchy to keep the OST folder structure or untick it and use Don't Export Empty Folders.
Which OST items upload to Office 365?
Emails with attachments, calendars, contacts, tasks and journals. Under Categories in Advanced Settings you tick the item types to upload.
Does PCVITA open a corrupt OST file?
Yes. Quick mode copes with light damage and Advance mode reaches data in a highly corrupted file. Set the mode before you click Add.
Is there a file size limit for OST files?
No. PCVITA sets no size limit on the OST file. Upload time depends on the amount of data in the mailbox.
Demo and Price Demo scope and licence cost
What does the free demo of OST to Office 365 Importer include?
25 items per folder. Demo edition loads your OST file, scans it and previews every email. It uploads a sample of 25 items per folder to Office 365.
How much does OST to Office 365 Importer cost?
$49 for one licence. Full edition lifts the 25 item cap. Your purchase includes a 30 day money back guarantee and an email with delivery details.
Can I preview my emails before I buy?
Yes. Preview works the same in the demo and the full edition. You can check message headers, MIME and attachments before you spend anything.
Compatibility and Accounts Office 365 plans, admin account, Windows, Outlook and encryption
Which Office 365 plans does the importer work with?
Enterprise E1, E3 and E5, Business Premium, Essentials, Exchange Online Plan 1 and Plan 2, plus Office 365 A1, A3, A5 and F1. Select the destination mailbox inside any of those plans.
What must the Office 365 admin account have?
Assigned license and impersonation. Impersonate the admin account before you upload into other users' mailboxes. Software Guide steps name an E3 license for that account.
Which Windows editions does the software support?
Windows Vista, 7, 8, 8.1 and 10 in 32 or 64 bit, along with Windows Server 2003, 2008 and 2012. Microsoft .NET Framework 4.5 or above must be on the PC.
Which Outlook versions does the importer cover?
Outlook 2000 up to Outlook 2019. OST files created by any of these versions load in 32 and 64 bit editions.
Does PCVITA remove S/MIME or OpenPGP encryption?
Yes, with your key. Supply the S/MIME certificate and its password or the OpenPGP private key and its password. PCVITA then strips that encryption from the emails.
Question not answered here? Ask on Live Chat or write to us from the Contact Us page.
What Buyers Say About PCVITA OST to Office 365 Importer
Ratings collected on pcvita.com and words from verified purchase reviews.
Almost it is impossible to upload OST file of size 83 MB in Office 365 account through manual steps. Pratically, I have devoted 3 to 4 days in doing the process for free but, no result came. Then, I decided to opt for third-party utility and luckily I found this product. The application is perfectly the best solution for importing OST to Office 365 cloud.
This tool is an easy-to-use program, which do what it says. Initially I have tested free versions of 5 to 6 products and among all, I found this PCVITA reliable for my need. I activated the licensed edition of the software and also, suggested it to many of my business friends. Thank you guys for this standalone approach!
GearDownload. 100% clean badge, no spyware, adware or viruses found in PCVITA software.
DownloadAtoZ. 5 star award badge for PCVITA software. See every badge on the PCVITA awards page.
Key Takeaways for OST to Office 365 Import
Five facts to keep in mind before you start.
- Files and versions. PCVITA loads OST files from Outlook 2000 up to Outlook 2019 at any size.
- Destination. Emails, contacts, calendars and tasks reach one mailbox or many through a CSV file with attachments in place.
- Admin account. Assign a license and impersonate the admin account before you upload into other mailboxes.
- Control. Preview in 8 views, filter by date or category and upload only the items you tick.
- Demo and price. Free demo uploads 25 items per folder. Full edition costs $49 and carries a 30 day guarantee.
Start Your OST Upload to Office 365 Today
Download the free demo, scan your OST file and check your emails in the preview. Buy the full edition after your test.
Safe & Secure · 30 Days Money Back*