GoKawiilMicrosoft confirms Teams, New Outlook crash on ARM Windows PCs after August update
Microsoft says its August 11, 2026 security update (KB5121003) is causing Teams and New Outlook to fail to launch or crash unexpectedly on ARM-based Windows 11 24H2 devices like the Surface Pro 11 and Surface Laptop 7. The problem mostly hits new or freshly imaged machines that haven't yet grabbed Microsoft Store updates, while Classic Outlook, Word and Excel remain unaffected.
GoKawiil's interpretation of the reporting above, not reported fact.
This adds to a growing list of stability problems tied to Microsoft's August 2026 patches, including a separate .NET Framework bug breaking printing and PDF export, raising concerns about update quality control. For enterprises relying on ARM Copilot+ PCs, unpredictable crashes in core communication tools like Teams and Outlook can disrupt daily operations until a permanent fix ships.
- Bug tied to KB5121003 breaks Teams and New Outlook on ARM Windows 11 24H2 devices.
- Temporary fix requires updating the Auto Super Resolution Package to version 1.0.19.0 or later via Microsoft Store.
- It's the latest in a string of August 2026 update issues, following a separate .NET Framework printing bug.
Microsoft Surface Pro 11 Copilot+ PC — The ARM-based Surface Pro 11 is exactly the machine at the center of this Teams and Outlook hiccup — and it's still one of the sleekest Copilot+ tablets-slash-laptops around. With Snapdragon silicon and Windows 11, it's built for all-day portability, and Microsoft's fix should have Teams launching normally again.
See Microsoft Surface Pro 11 Copilot+ PC on Amazon → Affiliate link — we may earn a commission on purchases, at no extra cost to you. Product picked by AI based on this article; it is not a tested recommendation.Source: bleepingcomputer.com, 2026-09-03
Published there as: “Microsoft Teams, Outlook fail to launch on ARM-based Windows PCs”
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