If your Outlook is refusing to launch or crashing at random, you might want to check for this unscheduled update.
Windows 11 KB5078127 is an 'out-of-band' patch to fix an issue that broke Outlook Classic (POP, PST) after January 2026 Patch ...
3don MSN
The first big Windows update of 2026 has bugs: Outlook freezes, app errors, and how to fix them
The first big Windows update of 2026 has bugs: Outlook freezes, app errors, and how to fix them ...
Microsoft confirmed that the KB5074109 January Windows 11 security update causes the classic Outlook desktop client to freeze ...
Microsoft admits that “Classic Outlook profiles with POP accounts and PSTs hang after Windows updates on January 13, 2026.” If you’re affected, you need to await a fix. “The Windows Team will be ...
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 shared a temporary workaround for customers experiencing Outlook freezes after installing this month's Windows ...
Windows 11 KB5074109 causes a black screen on some PCs, including those with an Nvidia GPU, and also freezes Outlook if you ...
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