GoKawiilMicrosoft resolves ARM Windows bug crashing Teams and Outlook via September patch
Microsoft has patched a bug that stopped Teams and the new Outlook for Windows from launching on ARM-based devices like the Surface Pro 11 and Surface Laptop 7. The issue, triggered by August 2026 security updates (KB5121003), mainly hit new or freshly imaged PCs without Microsoft Store updates. The fix arrived with the September 8 cumulative update, KB5124012.