Fixed: Outlook Out of Memory or System Resources

Practical Guide to Resolving Outlook Memory or System Insufficient Resource Errors

Outlook is a widely used tool for office work, but you may encounter an error message that prevents you from using: insufficient memory or system resources. Close certain windows or programs and try again. How to fix this error and make Outlook recovery work? Please read this MiniTool article.

Microsoft Outlook facilitates users to send mass emails, view calendars, encrypt important emails, and perform other actions. But one day, you may be unable to use this software due to a bug with insufficient memory or system resources. This article explains why this error occurs and how to resolve it in the following content.

Causes of insufficient memory or system resources errors

Many reasons can cause this error to appear in Outlook. The most basic reason is that as the error message shows, too many windows or programs are opened. If you open too many windows, they will take up a lot of system memory; therefore, you can't open Outlook as usual.

Other possible reasons are as follows:

• System RAM is limited or virtual memory is insufficient.
• The Outlook version is too old.
• The PST file is too large or corrupt.
• Other reasons.

How to fix insufficient memory or system resources error in Outlook

Method 1: End unnecessary program

Before considering the issues that occur in Outlook, you can simply close unused programs on your computer to free up some system memory for Outlook.

Step 1: Right-click on the Windows icon and select Task Manager from the context menu.

Step 2: You can browse the program list under the Process tab and select unnecessary programs.

Step 3: Right-click the program and select End Task .

After that, you can reopen Outlook to see if the error has been fixed. If it is not fixed, continue to the next solution.

Method 2: Update Outlook

Like running Windows systems, outdated versions of Outlook can also cause various problems, including insufficient memory or system resources. You can update the software and try to resolve the issue. If you can't open Outlook, just open other official software to update, such as Word, Excel, etc.

Step 1: Open Word document and click File Options.

Step 2: Select an account and you can find the update option in the right pane.

Step 3: Select Update Now .

Since the latest version will fix some bugs and provide advanced settings, this issue may be fixed after this operation.

Method 3: Recreate the OST file

OST files store files synchronized on your computer. An OST file integrity issue may cause this memory or system resource inadequate. You can rename this file and have Outlook recreate a new file to resolve this issue. Before you begin the following steps, you should make sure that no other Outlook projects are running in the background.

Step 1: Press Win R to open the "Run" window.

Step 2: Copy and paste %LocalAppData%/Microsoft/Outlook into the text box, and press Enter to go to the corresponding path.

Step 3: Rename the OST file and save the changes.

After that, restart Outlook to recreate the OST file and check if the issue is fixed.

You can get more information about OST files and PST files from this page.

Method 4: Reduce the memory cache size of PST file

The last method is to free up more space by reducing the size of the PST file. The PST file stores email and other Outlook settings information on Windows. Therefore, these files will take up more and more memory space on your computer. This method shows you how to shrink the PST file.

Step 1: Press Win R to open the "Run" window.

Step 2: Type regedit in the text box and press Enter to open the Registry Editor window.

Step 3: Navigate to HKEY_CURRENT_USER > SOFTWARE > Microsoft > Office > 1x.0 > Outlook > PST .

Step 4: Right-click the blank space on the right and select New > DWORD (32-bit) value to create a new child.

Step 5: Rename this child to UseLegacyCacheSize .

Step 6: Double-click the child and change the value data to 1 , and then click OK to save the changes.

You need to restart your computer to fully apply this change.

Summarize

It is common to encounter this memory or system resource error when using Outlook. Try fixing it using the above method.

Also, if you have deleted emails from Outlook but need to recover them, MiniTool Power Data Recovery can help you. This free file recovery software provides you with a secure data recovery service that will not damage your data during file recovery. For specific steps to recover emails, visit this blog.

If you have problems using our software, please feel free to contact us.

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