How to Fix ‘Outlook Out of Memory or System Resources’ Error

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Have you encountered the Outlook out of memory or system resources error? This frustrating issue can interrupt your workflow, slowing down Outlook and making it unresponsive. Many Outlook users have experienced this error, which usually indicates that Outlook is struggling with system resources due to various factors, like memory overload, outdated software, or excess PST files.

In this blog, we’ll go over everything you need to know about fixing this problem. You’ll learn about the most common causes, as well as several solutions to restore Outlook’s performance. By following these simple steps, you can have Outlook back in top shape in no time.

Common Causes of ‘Out of Memory or System Resources’ Error

The Outlook out of memory or system resources error can happen for several reasons. Understanding what’s causing the issue is the first step toward fixing it.

1. High Memory Usage by Outlook

If you’ve been running Outlook with multiple windows open for long periods, it’s possible the application is consuming a lot of RAM. This high memory usage can lead to an error, especially if other programs are also using system resources.

2. Excessive PST Files

Outlook stores emails, contacts, and other data in PST (Personal Storage Table) files. When there are too many PST files, or if these files are large, Outlook can struggle to load or access them, consuming significant resources and memory.

3. Faulty Add-Ins

Some Outlook add-ins may not work correctly, causing the program to freeze or experience resource-related issues. Add-ins, especially older or outdated ones, can sometimes conflict with Outlook’s newer versions.

4. Outdated Outlook Version

Running an outdated version of Microsoft Outlook may lead to various performance issues, including system resource errors. Outdated software can have compatibility issues with newer systems, which often leads to memory-related problems.

5. Large Cache Size

Outlook saves a lot of data in the cache to improve performance. However, a bloated cache can lead to memory errors over time.

Solutions to Troubleshoot ‘Out of Memory or System Resources’ Error

Once you understand the common causes, it’s time to take action. Let’s explore some of the most effective solutions to fix the Outlook out of memory or system resources error.

1. Monitor Resource Usage

Keeping an eye on your system’s resource usage can help you determine whether Outlook is consuming too much memory. Use Task Manager (Windows) or Activity Monitor (Mac) to check how much memory Outlook is using. If it’s high, consider closing other applications or moving to a solution that reduces Outlook’s load.

2. Restart and Update Outlook

Sometimes, a simple restart can resolve memory issues. Close Outlook and all other unnecessary applications, then reopen it. Make sure you’re also using the latest version of Outlook. Regular updates can resolve compatibility issues and improve performance.

  • How to Update Outlook: Open Outlook, go to File > Office Account > Update Options, and select Update Now.

3. System Resource Optimization for Outlook

If your system resources are low, try increasing them by adjusting virtual memory settings. Virtual memory acts as extra storage that can help alleviate memory issues. To change it on Windows:

  1. Open System Properties.
  2. Go to Advanced System Settings > Performance Settings.
  3. Select the Advanced tab and adjust the Virtual Memory settings.

4. Locate and Remove Outlook’s Faulty Add-Ins

Faulty add-ins can be one of the major causes of system resource issues in Outlook. Here’s how to check and disable any problematic add-ins:

  1. Go to File > Options > Add-ins.
  2. At the bottom, choose COM Add-ins and click Go.
  3. Uncheck any add-ins that may be causing issues, then restart Outlook.

5. Repair Outlook Installation

Sometimes, the Outlook installation may become corrupted, causing errors. Repairing the installation can restore missing or corrupted files, potentially resolving the error.

  • How to Repair: Go to Control Panel > Programs > Programs and Features, select Microsoft Office, and choose Repair.

6. Reduce Unnecessary PST Files

If you have many PST files in Outlook, try reducing them to minimize system resource usage. Remove any PST files you no longer need or archive them. You can also compress the PST files to save memory.

  • How to Compress PST: Right-click on the PST file, go to Data File Properties > Advanced, and select Compact Now.

7. Use ScanPST.exe to Repair PST Files

Outlook includes a built-in Inbox Repair Tool (ScanPST.exe) that can repair corrupted PST files, helping to free up resources and improve performance.

  • How to Use ScanPST.exe: Locate the ScanPST.exe file in your Office folder, open it, and select the PST file you wish to scan. Follow the prompts to repair any errors.

8. Reduce Cache Size by Registry

Adjusting the cache size in the registry can also reduce Outlook memory usage. This requires caution, as registry changes can affect system stability. If you’re not familiar with the registry, consider seeking professional help.

  1. Press Win + R, type regedit, and press Enter.
  2. Navigate to the Outlook cache folder and adjust the cache size.

Important Note: Always back up your registry before making any changes.

Additional Tips for Keeping Outlook Running Smoothly

After fixing the Outlook out of memory or system resources error, it’s essential to maintain a smooth-running Outlook by following these tips:

  1. Clear Cache Regularly: Routine clearing of the cache can prevent resource issues.
  2. Limit Open Emails and Windows: Try to keep the number of open email windows to a minimum.
  3. Manage PST Size: Regularly archive or delete old emails to keep your PST files manageable.
  4. Disable Unused Add-Ins: Only enable add-ins that you use frequently.
  5. Restart Outlook Daily: A quick restart can refresh resources and prevent memory overload.

FAQ

What causes the ‘Out of Memory or System Resources’ error in Outlook?

This error is usually caused by high memory usage, too many PST files, faulty add-ins, or an outdated version of Outlook.

How can I monitor Outlook’s memory usage?
You can use Task Manager (Windows) or Activity Monitor (Mac) to check how much memory Outlook is consuming.

Will updating Outlook fix the error?
Yes, updating Outlook can fix bugs and improve performance, potentially resolving the error.

How do I disable faulty add-ins in Outlook?
Go to File > Options > Add-ins, select COM Add-ins, and uncheck any add-ins you want to disable.

Can I repair Outlook to fix memory issues?
Yes, repairing the Outlook installation can resolve corrupted files, which may help fix memory errors.

How do I reduce the size of PST files?
Right-click the PST file, go to Data File Properties > Advanced, and select Compact Now.

What is ScanPST.exe, and how does it help?
ScanPST.exe is Outlook’s repair tool for PST files, which can fix corrupted files and reduce resource issues.

How can I reduce cache size in Outlook?
You can clear or reduce cache by adjusting settings in the registry, but back up your registry first.

Will restarting Outlook help with memory errors?
Yes, restarting Outlook can refresh resources and reduce memory usage, often fixing minor errors.

What if the error persists after trying these solutions?
If the error continues, consult a technician to check for deeper issues with Outlook or your system.

Conclusion

Dealing with the Outlook out of memory or system resources error can be frustrating, but by following these steps, you can quickly restore Outlook’s performance. Whether it’s monitoring resource usageupdating Outlookremoving add-ins, or reducing PST files, each solution is designed to help optimize Outlook and your overall system.


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