5 Fixes for Microsoft Outlook Out of Memory or System Resources Error on Windows

Pankil is a Civil Engineer turned freelance writer. Since his arrival at Guiding Tech in 2021, he delves into the world of how-tos, and troubleshooting guides for Android, iOS, and Windows. Besides his new-found love for mechanical keyboards, he’s a disciplined footfall fan and loves international travel with his wife.

Fix 1: Run the Inbox Repair Tool

Damaged or corrupted PST or OST files can cause Outlook torun 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 theWindows key + Eto open File Explorer and navigate to the following folder.

Step 2:Double-click theSCANPST.EXEfile.

Step 3:ClickStartto initiate the scan.

Step 4:Click onRepairif the tool finds any issues.

Fix 2: Remove Unwanted Outlook PST Files

Too many PST files, especially large ones, can affect Outlook’s performance and cause it to display the “Out of memory or system resources” error on Windows. To avoid this, consider removing unnecessary PST files using these steps:

Step 1:Press theWindows key + Rto open the Run dialog box. Typecontrolin the text field and pressEnter.

Step 2:Change the view type toLarge iconsand selectMail (Microsoft Outlook).

Step 3:Click theData Filesbutton.

Step 4:Select the PST file you don’t need and click onRemove.

Fix 3: Reduce Memory Cache Size for Outlook Data Files

If you don’t want to delete any Outlook PST files, you can reduce the memory cache size for those data files to fix the problem. Here’s how to go about it.

Step 1:Close the Outlook app on your PC. Click thesearch iconon the taskbar, typeregistry editor, and selectRun as administrator.

Step 2:In the Registry Editor window, paste the following path in the address bar at the top and pressEnter.

Step 3:Right-click on thePSTkey, go toNew, and selectDWORD (32-bit) Value. Name itUseLegacyCacheSize.

Step 4:Double-click theUseLegacyCacheSizeDWORD and change its value data to1. Then, clickOK.

Fix 4: Increase the Size of the Memory Heap

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

Step 1:OpenRegistry Editorusing the search menu.

Step 2:Paste the following path in the address bar at the top and pressEnter.

Step 3:Right-click on theWindows Messaging Subsystemkey > go toNew> selectDWORD (32-bit) Value. Name itSharedMemMaxSize.

Step 4:Double-click the newly createdDWORD. Type300000in the value data field and clickOK.

Step 5:Right-click on theWindows Messaging Subsystemkey, go toNew, and selectKey. Name itApplications.

Step 6:Right-click on theApplicationskey, go toNew, and selectKey. Name itOutlook.

Step 7:Right-click on theOutlookkey, go toNew, and selectDWORD (32-bit) Value. Name itSharedMemMaxSize.

Step 8:Double-click theSharedMemMaxSizeDWORD, type300000in the value data field, and clickOK.

Fix 5: Run the Office Repair Tool

If all else fails, run the Microsoft Office Repair tool to fix Outlook’s “Out of memory or system resources” error.

Step 1:Press theWindows key + Rto open the Run dialog box. Typeappwiz.cplin the box and pressEnter.

Step 2:In the Programs and Features window, select the Microsoft Office product on the list and click theChangebutton at the top.

Step 3:SelectOnline Repairand clickRepair.

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Last updated on 07 May, 2024

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