Classic Outlook POP account profiles hang and freeze after Windows 11 update to KB5074109

Last Updated: January 15, 2026

ISSUE

After updating Windows 11 to KB5074109 January 13, 2026 users with Outlook POP account profiles report that Outlook is not exiting properly. This means that Outlook will not restart after you close it.   

In addition, some users report issues with Outlook hangs or freezes.   

This is an emerging issue, and we don’t have all the symptoms yet, but we will update the topic as we understand the issue better.

STATUS: INVESTIGATING

The Outlook and Windows Teams are investigating this issue. We will update when we know more. 

This issue is being discussed in the Learn forums if you want to ask questions or share feedback here:

Outlook Classic not opening properly or recording sent mails after 2026-01 Security Update (KB5074109) (26200.7623)

Additional Resources

January 13, 2026—KB5074109 (OS Builds 26200.7623 and 26100.7623)

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See Also

Fixes or workarounds for recent issues in classic Outlook for Windows