Top 6 Fixes for Out of Memory or System Resources Error in Microsoft Outlook

Does it continue? Microsoft Outlook Are you getting the error "Out of memory or system resources" on your Windows 10 or 11 computer? If so, it's definitely a cause for concern. It can cause Outlook to close unexpectedly, disrupting your workflow.

There are several factors that can affect Microsoft Outlook's performance on Windows, including the amount of RAM available on your computer, the size of your mailbox, the number of data files, and more. To help, we've listed all the possible solutions to fix this Outlook error.

1. Close background applications and programs.

A common cause of memory issues in Microsoft Outlook is having too many applications and programs running in the background. To start, you can: Using Task Manager on Windows To identify and close applications and programs that are using a large amount of your computer's memory.

Step 1: Press the keyboard shortcut Control + Shift + Escape To run Task Manager. In the tab "Operations", Click the Memory header to sort apps based on their RAM usage.

Step 2: Select the program you don't need and click the button. "Finish the job" At the top. Repeat this step to close all unwanted applications and programs.

This should help free up memory on your computer and prevent Microsoft Outlook from displaying errors like: “Out of memory or system resources” Or “System resources are very low.”

2. Run the Inbox Repair Tool

Corrupted or damaged PST or OST files can also cause Outlook to run out of memory on your Windows computer. Fortunately, Microsoft Outlook includes a tool that automatically repairs your data files. Here's how to run it.

Step 1: Press the keyboard shortcut Windows + E To open File Explorer And move to the next folder.

C:\Program Files\Microsoft Office\root\Office16

Step 2: Double-click a file SCANPST.EXE.

Step 3: Click START YOUR To start the scan.

Step 4: Click the button "Repair" If the tool finds any issues.

3. Remove unwanted Outlook PST files

Having too many PST files, especially large ones, can impact Outlook's performance and cause the "Out of memory or system resources" error on Windows. To avoid this, you may want to consider removing unnecessary PST files using the following steps:

Step 1: Press the keyboard shortcut Windows + R To open the dialog box "employment". Type the control in the text field and press Enter.

Step 2: Change type Display To large icons and select Mail (Microsoft Outlook).

Step 3: Click the button Data files.

Step 4: Select a file PST which you don't need and click on the option Removal.

4. Reduce the size of the Outlook data files cache

If you don't want to delete any Outlook PST files, you can reduce the cache size of these data files to fix the issue. Since this process involves modifying registry files, you must do so. Backup all registry files Or Create a restore point Before proceeding. This will allow you to restore the registry to its previous state if something goes wrong.

Step 1: Close the application Outlook on your computer.

Step 2: Click on the icon Search On the taskbar, type Registry Editor, then select Run as administrator.

Step 3: Locate yes When the User Account Control (UAC) prompt appears.

Step 4: In the Registry Editor window, paste the following path into the address bar at the top and press Enter.

HKEY_CURRENT_USER \ Software \ Microsoft \ Office \ 16.0 \ Outlook \ PST

Step 5: Right click on the key PST, Go to New, and select DWORD (32-bit) Value. Name it UseLegacyCacheSize.

Step 6: Double-click the UseLegacyCacheSize DWORD and change its value data to: 1. Then click OKAY.

After completing the above steps, restart your computer and check if the error persists.

5. Increase the heap size

Another thing you can do is increase the heap size for Microsoft Outlook, which will allow the program to use more memory during runtime. This process also requires editing registry files, so follow the instructions carefully.

Step 1: Press the keyboard shortcut Windows + R To open the dialog box "employment". Type regedit in the box and click Enter.

Step 2: Locate yes When the User Account Control (UAC) prompt appears.

Step 3: Paste the following path into the address bar at the top and press Enter:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows Messaging Subsystem

Step 4: Right-click on the Windows Messaging Subsystem key, and go to new, Specify a DWORD (32-bit) value. Name it SharedMemMaxSize.

Step 5: Double click DWORD newly created. Type 300000 In the Value data field, click OK.

Step 6: Right-click on the System key. Windows Messaging Sub, go to New and select a key. Name it Applications.

Step 7: Right click on the key Applications, and go to New and select a key. Name it Outlook.

Step 8: Right click on the key Outlook, and go to new, Specify the DWORD value. (32 bit)Name it. SharedMemMaxSize.

Step 9: Double-click SharedMemMaxSize DWORD, And type 300000 In the Value data field, click OK.

Restart your computer after completing the steps above. After that, Microsoft Outlook should no longer display the error. “Out of memory or system resources” On a Windows 10 or 11 computer.

6. Run the Office Repair Tool.

Finally, you can run the Microsoft Office Repair Tool if all else fails. It can help fix performance issues for any Office application, including Outlook.

Step 1: Press the keyboard shortcut Windows + R to open the dialog box. "employment". Type appwiz.cpl in the box and press OK. Enter.

Step 2: In the Programs and Features window, select a product. Microsoft Office In the menu, click the button. "A change" above.

Step 3: Select an option Online repair And click repair.

Make memory errors a thing of the past.

Microsoft Outlook can sometimes be a bit resource-intensive. However, it can be frustrating if Outlook keeps unexpectedly closing and displays errors such as "Out of memory or system resources" or "Outlook has used up all shared resources." Hopefully, one of the tips above helped resolve the issue of running out of memory or system resources in Microsoft Outlook.