Uninstall Windows 11 KB5074109 to Resolve Outlook POP, PST Issues
Recent feedback from users has pointed to significant issues with Outlook Classic as a result of the Windows 11 KB5074109 update. Many users have reported that Outlook becomes unresponsive, especially when utilizing POP accounts or when dealing with PST files. If you are experiencing these problems, it is advisable to consider uninstalling this update or using webmail as an alternative.
Background on Windows 11 KB5074109
The Windows 11 KB5074109 update, rolled out on January 13, 2026, is mandatory. Users can confirm they have this update installed by checking their system information for OS Build 26200.7623 or 26100.7623.
Impact on Outlook Classic
- Outlook Classic, which specifically handles POP accounts, may cease functioning properly.
- PST files, crucial for storing emails and other Outlook data, can also be affected.
When Outlook Classic attempts to utilize OneDrive for syncing PST files, complications arise. Outlook requires exclusive access to PST files, but OneDrive may retain locks on these files during synchronization, leading to unresponsiveness in Outlook. Users often find their emails not displaying correctly and the application being stuck in a “Not Responding” state.
Recommended Actions for Affected Users
Microsoft has acknowledged these issues in a support document, suggesting that users opt for webmail as a practical workaround. However, if webmail is not a feasible option, the recommended solution is to uninstall Windows 11 KB5074109.
Steps to Uninstall Windows 11 KB5074109
- Navigate to Settings.
- Go to Windows Update.
- Select Update History.
- Click on Uninstall Updates.
- Locate KB5074109 and select “Uninstall.”
- Confirm the uninstallation and allow Windows to reboot.
After removing the update, users should also consider pausing future updates to prevent the recurring issues related to Outlook Classic.
Potential Security Risks
While uninstalling KB5074109 may resolve current issues with Outlook, it is crucial to note the potential security risks. This update was designed to fix over 100 security vulnerabilities, and removing it may expose your system to threats.
Other Issues Related to Windows 11 KB5074109
Besides the problems affecting Outlook Classic, the update has resulted in several other pressing issues for users:
- Black screen occurrences during startup.
- Loss of desktop personalization, including backgrounds.
- Failures related to the Sleep mode (S3) functionality.
- Inability to apply folder customizations in File Explorer.
Various applications have also reported unresponsiveness or errors, blocking access to files stored on services like OneDrive and Dropbox. Microsoft is currently identifying potential workarounds for these complications.
In conclusion, if you are facing issues with Outlook Classic due to Windows 11 KB5074109, consider uninstalling the update while being cautious of the associated security risks. Stay informed about any future updates from Microsoft regarding these ongoing challenges.
