Microsoft fixes Teams, Outlook launch failures on ARM Windows PCs
Microsoft fixed in KB5124012 a bug stopping Teams and new Outlook from launching on ARM Windows 11 PCs.
Microsoft confirmed Teams and the new Outlook could fail to launch or crash on ARM-based Windows 11 24H2+ devices such as Surface Pro 11 after installing updates from August 11, 2026 (KB5121003), mainly on machines without Microsoft Store updates. The September 8, 2026 Patch Tuesday cumulative update KB5124012 resolved the issue. Updating the Auto Super Resolution Package had served as a temporary workaround.
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