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Resolved Windows release health · Windows 11, version 26H1 and 2 more versions

Microsoft Teams and Outlook might fail to launch on ARM-based devices

This most likely occurs on new PCs after installing the August Windows security update and does not affect other apps.

Microsoft release health

What to do

Resolved by KB5124012. Install it, or any later update for your Windows version, on affected devices.

Fixed by KB5124012 Published 8 Sep 2026 · OS build 28000.2954
28Days from the update that caused it to the fix
0/3Windows versions where it is open
8 SepLast updated by Microsoft · 36d ago

Status on each Windows version

Microsoft can list one issue differently per version
Windows versionStatusCaused byFixed byUpdated
Windows 11, version 26H1Home and Pro · Enterprise and Education Resolved KB5121000 · 11 Aug KB5124012 8 Sep
Windows 11, version 25H2Home and Pro · Enterprise and Education Resolved KB5121003 · 11 Aug KB5124008 8 Sep
Windows 11, version 24H2Enterprise and Education · LTSC Resolved KB5121003 · 11 Aug KB5124008 8 Sep

The update that caused it

What changed

First observed 14 Oct 2026

No field changes in the recorded history.

Cite this recorded revision to keep the same title, summary, facts and links when the page changes.

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ChangeIntel

An IT change radar: releases, security, known issues, retirements, documentation changes, and service status from public sources. Every item links to supporting evidence; dates and statuses can change after they are read.

Sources read 14 Oct 11:21 UTC · 251 of 253 readable · 250 fully read · documentation 0/409 current

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