Microsoft update disarms Outlook and Teams on Arm PCs
- ID
- 20663
- Status
- summarized
- Published
- 02 Sep 2026, 8:30 PM
- Fetched
- 02 Sep 2026, 9:14 PM
- Provider
- The Register
- Category
- technology
- Original URL
- https://www.theregister.com/os-platforms/2026/09/02/microsoft-update-disarms-outlook-and-teams-on-arm-pcs/5293849
- Source URL
- https://www.theregister.com/headlines.atom
Summary
- Score
- 3.0
- Created
- 02 Sep 2026, 9:14 PM
- Tags
- Audience
- developers
What happened
Microsoft's August 2026 security update (KB5121003) causes the new Outlook and Teams to fail to launch or crash on ARM-based Windows devices including Surface Pro 11 and Surface Laptop 7. The workaround is installing the Auto Super Resolution Package v1.0.19.0 or later from the Microsoft Store—a package designed for AI game upscaling. A separate August 27 preview update resets custom mouse cursors to defaults on non-English Windows 11 24H2/25H2 installations.
Why it matters
If your team or customers use ARM Windows devices (Surface Pro 11, Surface Laptop 7, Snapdragon X2 hardware), patch KB5121003 can break Outlook and Teams with no root-cause explanation from Microsoft yet. The fix—installing an AI gaming package—is bizarre and worth noting as a cautionary tale of Windows update reliability on ARM. For most builders not shipping to ARM Windows endpoints, this is low-impact.
Discussion angle
Microsoft's own Copilot+ ARM push is undermined by updates that break first-party apps and require a gaming package as a fix—what does this signal about ARM Windows readiness for enterprise deployment?