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Windows 11 KB5078127 emergency update (25H2) fixes Outlook POP, PST crashes, unresponsive apps after January 2026 Patch Tuesday

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Windows Latest

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The Windows 11 KB5078127 emergency update, also known as 25H2, addresses issues with Outlook Classic (POP, PST) crashes and unresponsive apps following the January 2026 Patch Tuesday. This out-of-band patch is mandatory and fixes severe problems affecting various apps on Windows 11. The update can be found on the Windows Update page and takes about 5 minutes to download and 3 minutes to install. It is the second emergency update for Windows 11 in less than ten days, following the optional KB5077744 release.

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