Windows update intelligence
Teams and Outlook launch failures on ARM
Some ARM-based PCs cannot launch Teams or Outlook after the August update.
ResolvedC3 · Microsoft confirmedMajor impactSnapshot checked 2026-09-15
Does this match your environment?
- Windows scope
- 24H2
- Architecture
- ARM64
- App / driver
- Teams / Outlook
- Conditions
- ARM-based Windows 11 24H2 devices; the source singles out new PCs.
A matching version is only a starting point. This page does not diagnose an individual device.
Evidence & current resolution
Microsoft lists this scope as resolved on 2026-09-08. Resolving update: KB5124008.
- Evidence ID
- official-arm-office-launch
- Source groups
- 1 · official publication
- Evidence basis
- Manually reviewed public source; no independent device test
Suggest a correction
Recorded timeline
2026-08-11
Originating update released
KB51210032026-09-08
Official resolution recorded
KB5124008
2026-09-15
Snapshot reviewed
Added to this curated collection. Earlier acknowledgement time was not independently captured.
Follow official guidance for your environment. We do not provide automatic rollback or security-disable actions.