A strong tool for organizing calendars, projects, and emails is Microsoft Outlook. Nevertheless, users may experience performance problems, such memory leaks, which can significantly reduce productivity. According to MO907654, one such problem is that Outlook Classic’s calendar view causes memory use to rise at a rate of 20–40 MB per second, while other views stay unaffected. The possible causes of MO907654 are examined in this article along with practical methods for diagnosing and treating it.

Symptoms of the Issue (MO907654)

When the calendar view is open, the main sign of MO907654 is a sharp rise in memory use. Outlook may become sluggish, unresponsive, or even crash as a result of memory utilization spikes of 20–40 MB per second. Other views like Mail, Tasks, or the Calendar Preview are unaffected by this problem, which is exclusive to the conventional calendar view. As Outlook uses more memory, users could also see a decrease in the overall speed of their machine. You’re probably dealing with MO907654 if you’re exhibiting these symptoms.

Potential Causes 

Outlook’s calendar view memory leak might be caused by a number of things. Corrupted calendar data is one potential reason. Outlook may have trouble rendering some calendar entries or events if they are corrupted, which might result in high memory use. Problems with the Outlook cache are another possible reason. Performance issues might arise from corrupted or huge OST/PST files, particularly in views that need to present a lot of data. Even Microsoft-built add-ins and extensions have the potential to cause MO907654 by interfering with the calendar display.

Furthermore, defects or compatibility problems that cause memory leaks may be introduced by recent upgrades to Windows or Outlook. For instance, a recent update can be the cause if you’re running Outlook Version 2409 Build 16.0.18025.20030 on Windows 11 Pro (Build 22631.4317). Given how much the calendar view depends on graphical rendering, problems with graphics or rendering might also arise. Graphics drivers that are outdated or incompatible may make the issue worse. Finally, MO907654 may result from synchronization problems or damaged data introduced by third-party calendar integrations like Google Calendar or iCloud.

Troubleshooting Steps for MO907654

The first step in fixing MO907654 is to look for any corrupted calendar items. To determine whether a particular event or item is the source of the problem, switch to a different calendar view, such as List view. Remove or relocate any questionable objects to a temporary folder and see whether the memory leak continues. Next, fix the data files in Outlook. Close Outlook, pick your Outlook profile, click Settings, go to Mail > Data Files, and then open the Control Panel. To scan and address any problems with your OST/PST files, select Repair.

Disable all add-ins, including Microsoft add-ins, then restart Outlook if the problem continues. To determine whether a particular add-in is the source of MO907654, re-enable each add-in individually. By clicking Windows + R, running outlook.exe /safe, and then hitting Enter, you may also launch Outlook in Safe Mode. To check if the memory leak still exists, open the calendar view in Safe Mode. If the problem does not arise in Safe Mode, it suggests that a modification or add-in is the source of the issue.

Updating, Repairing, and Reconfiguring Outlook

Another good approach is to update or fix Outlook. Check for updates by opening Microsoft 365 Apps. Use the Office Repair Tool by selecting Control Panel > Programs > Microsoft 365 > Change > Repair if MO907654 continues. Check and update your graphics drivers to the most recent version as well. Go to File > Options > Advanced and uncheck “Disable hardware graphics acceleration” under Display to turn off hardware acceleration in Outlook.

Resolving MO907654 may also be accomplished by creating a new Outlook profile. Create a new profile and make it the default by going to Control Panel > Mail > Show Profiles. Check to see whether the problem still exists after resetting your email accounts. Finally, select Settings > Windows Update > Check for updates to make sure your Windows 11 installation is current.

Advanced Troubleshooting 

Think about using more sophisticated methods if the fundamental troubleshooting procedures are unable to fix MO907654. Using Outlook’s logging tool to record specifics about the problem is one method. To activate logging, select File > Options > Advanced and select “Enable troubleshooting logging.” Examine the logs for any mistakes or trends that could indicate MO907654’s underlying cause.

Resetting the calendar view settings is an additional sophisticated procedure. After closing Outlook, go to the registry key HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Outlook\Views and remove the calendar view-related subkeys. When making registry edits, use caution because making the wrong changes might make the system unstable. Restart Outlook after removing the subkeys to see whether the memory leak still exists.

Importance of Monitoring System Performance

It’s critical to keep an eye on your system’s performance while addressing problems such as MO907654. Use third-party monitoring software or tools like Task Manager to keep tabs on disk activity, CPU performance, and memory consumption. You can more precisely identify the issue’s origin by spotting trends or spikes in resource utilization. By keeping an eye on your system on a regular basis, you may also identify any problems early on and stop them from becoming bigger ones.

Preventive Measures for MO907654

Organize your calendar and archive obsolete things on a regular basis to avoid problems such as MO907654. Compatibility problems can also be avoided by keeping Windows and Outlook up to date. Third-party add-ins might cause instability, so only use them when absolutely required. Use Task Manager to keep an eye on your system’s memory utilization in order to spot possible problems early and address them before they become more serious.

Final Thoughts

MO907654, the quick memory leak in Outlook’s calendar view, is a complicated problem that may be caused by software defects, damaged data, or add-ins. Mo907654’s underlying cause may be found and fixed by following the aforementioned troubleshooting procedures. If the problem continues, contacting Microsoft Support with specific details will enable you to receive expert support.

Before making major changes to Outlook, including fixing data files or generating a new profile, don’t forget to backup your data. You may resume effectively managing your calendar and restore Outlook’s functionality with perseverance and methodical troubleshooting.