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Microsoft releases update to fix another Windows 11 bug

On Saturday, Microsoft released emergency update KB5078127 for supported Windows 11 versions, rolling it out through Windows Update accessible via Settings > Windows Update.
After the January 13, 2026 Patch Tuesday update, Microsoft said it inadvertently created several problems for Windows 10 and 11 devices, prompting a Jan. 17 patch addressing two issues.
Apps that open or save files in cloud-backed locations are unresponsive or error-prone, while classic Outlook with PST files on OneDrive freezes and some Windows 11 24H2 and 25H2 devices fail boot with an UNMOUNTABLE_BOOT_VOLUME stop code.
IT administrators faced a busy Monday after weekend emergency patches while Microsoft alerted IT staff it is investigating boot failures on 24H2 and 25H2 devices.
This year has got off to a rough start for Microsoft as January fixes spawned multiple glitches, some isolated to hardware and software configurations, raising trust questions for IT admins and Windows users.

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