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Fix the Outlook Error: Out of Memory or System Resources

Published By Mohit Jha
Tej Pratap Shukla
Approved By Tej Pratap Shukla
Published On January 16th, 2024
Reading Time 3 Minutes Reading

While trying to download the email messages from POP3 Server to PST folder, one of the user gets the following error.

Sending and Receiving reported error (0x8007000E): Out of memory or system resources. Close some windows or programs and try again.

Out of Memory or System Resources

Possible Cause

The reason of getting the “out of memory or system resource” error is you are trying to download more messages that your system can process.

Another reason is Outlook allocates more memory for caching PST files to increase the performance but this will reduce the number of PST that can be opened at one time.

According to Microsoft article a computer with 64 megabytes (MB) of RAM runs out of resources and give this error after downloading max of 1,200 messages (approx.).


You can try out two solution in order to resolve the out of memory or system resource error.

  1. Reduce the number of PST file.
  2. Reduce memory cache-size for PST file using Regedit.
  3. Extract attachments from Outlook and delete unnecessary emails

Method 1. Reduce Number of PST Files in MS Outlook

You can disconnect PST files which are not used actively from Outlook. This will reduce the number of PST file and remove the Outlook failed to add the personal store to the session and out of memory or system resource error. Also it is recommended to not to open so many PST files as this will slow down the performance of Outlook and consume unnecessary resources.

Method 2. Reduce Memory Cache-Size per PST Using Registry

The alternative solution for the Out of Memory or System Resources Outlook 2010 PST error is to change registry settings. Below are steps that you can follow in order to reduce memory cache-size per PST.

Step 1: Backup your Registry settings first.

Step 2: Open Registry and locate the following key


Value name: ShowBCC
Value type: REG_DWORD
Value: 1

Note: By reducing the cache-size per PST, Outlook performance will decrease.

Method 3. Extract Heavy Attachments from MS Outlook

Having heavy attachments integrated with Outlook emails makes the application out of memory and darn slow. Due to these large sized attachments, Outlook mailbox exceeds its defined size limit and takes too long to load. Despite this, it becomes sluggish when it comes to send or receive emails; in short it takes a lot of time to perform all operations. Hence, it is recommended to extract attachments from Outlook emails and delete all the unnecessary emails to make free space free in email client. Doing this will resolve Out of Memory or System Resources Outlook error in a few simple clicks even without any hassle.

Concluding Thoughts

Microsoft Outlook is an eminent email client used to send, receive, and manage emails and other data items. But, over time users receive and send so many emails, which makes their Outlook Out of Memory or System Resources. Therefore, this article discloses some simple techniques to fix Out of Memory or System Resources Outlook 2016/ 2013/ 2010/ 2007/ 2003 error prompt.


By Mohit Jha

Mohit is a Microsoft-certified expert who has assisted thousands of clients with Outlook & Microsoft Office 365 issues. He enjoys writing on email clients as well as data migration. He is always excited about giving troubled readers the most up-to-date knowledge, explanation, and refinements.