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My classic Outlook keeps freezing and will not restart. When I restart Window it says Outlook has not close down completely. After restarting Windows and opening Outlook, it downloads all the emails I previously deleted three days ago. And then freezes after clicking on a few emails or task within Outlook.
Using Classic Outlook on Windows for personal email, calendar, and contact management
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I have similar problem starting from this morning. Uninstalled the KB5074109, it works now. Hope it won't freeze again tomorrow😅
2026-01-25 - A fix for the KB5074109 Outlook/OneDrive bug has been released as KB5078127.
If you use Classic Outlook for Windows and have any POP email accounts, this is a know bug:
Temp fix is to uninstall the Jan 2026 Update KB5074109 and Pause Windows Updates. Or move any PST files out of the OneDrive folder.
If you can not uninstall KB5074109 thru normal means, see this Q&A thread for alternatives. Or contact Microsoft Support (https://support.microsoft.com) and reference the Support Article above.
How to Pause Windows Updates
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Hi,
Do you remember installing the January update before this issue occurred?
If yes, many users have reported the same issue where Outlook POP account profiles hang or freeze after installing the Windows 11 update KB5074109. Microsoft is already aware of this issue and is currently investigating the problem.
They will update the status in the link below as soon as more information becomes available:
In that article, they also shared a thread from Microsoft Q&A related to the same issue. Some users mentioned that uninstalling the latest update resolved the problem for them.
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Message: Microsoft Outlook (not responding). I've tried everything possible for 2 days, nothing works. I go into Outlook, click on an email message, it gives me "Microsoft Outlook not responding", then all emails go grey and freezes. Have tried call Microsoft Support never gets a Live agent. HELP!
@Alma Thompson said
I've tried everything possible for 2 days
Make sure you have all of the latest Windows Updates. Specifically KB5078127 which is a fix for a recent Outlook problem.
Have tried call Microsoft Support never gets a Live agent.
Try Chat Support instead of phone. You usually can reach someone that way.
MS 365 User Support https://www.microsoft.com/en-us/microsoft-365/support
Free Chat Support https://support.microsoft.com/home/contact