Microsoft releases second emergency Windows 11 update to fix Outlook crashes

Microsoft issued another out-of-band update to fix a bug that caused Outlook to crash for Windows 11 users. This second emergency patch addresses issues seen with Outlook and files stored in the cloud following Microsoft's January 2026 Windows security update.
Windows Latest

Microsoft says uninstall Windows 11 KB5074109 to fix Outlook POP, PST hang, as 2026’s first update causes havoc

If your Outlook Classic freezes or hangs when you use POP accounts or deal with PST files, you'll need to remove Windows 11 KB5074109.
XDA Developers on MSN

Windows 11's January update is causing chaos with Outlook, and there's no fix yet

There are workarounds, though.

Microsoft releases emergency OOB update to fix Outlook freezes

Microsoft has released emergency, out-of-band updates on Saturday for Windows 10, Windows 11, and Windows Server to fix an issue that prevented Microsoft Outlook classic from opening when using PSTs stored in cloud storage.
Windows Report

Windows 11 KB5074109 Breaks Outlook for POP Accounts, Microsoft Confirms Issue

Windows 11 KB5074109 causes Outlook freezing for POP accounts. Microsoft confirms the issue and investigates a permanent fix.