Microsoft issued an out-of-band Windows 11 update (KB5086672) to replace the pulled March 2026 optional preview (KB5079391) after users encountered 0x80073712 installation errors. The emergency patch supersedes previous updates and restores protections while Microsoft continues to address related post‑Patch Tuesday issues. #KB5079391 #KB5086672
Keypoints
- Microsoft pulled the optional March 2026 preview update KB5079391 after widespread 0x80073712 installation errors.
- An out-of-band cumulative update, KB5086672, was released to replace the broken preview and includes all March protections and fixes.
- Devices with automatic updates enabled may receive KB5086672 via Windows Update, otherwise it can be installed manually in Settings > Windows Update.
- This emergency release follows recent OOB updates addressing sign-in breaks in Microsoft apps, a Bluetooth visibility bug, and RRAS security issues.
- Microsoft also published guidance for fixing C: drive access problems on Samsung Windows 11 laptops caused by Samsung app issues.