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Microsoft Teams and Outlook for Windows launch failure on ARM-based Windows PCs

Service Disruption
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Last updated
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H score 0
1 unique sources, 1 articles

Summary

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Microsoft fixed a launch failure that caused Teams and the new Outlook for Windows to fail to open or close unexpectedly on ARM-based Windows devices after August 11, 2026 updates. The disruption affected Windows 11 24H2 or later systems, especially new or freshly imaged PCs that had not yet installed Microsoft Store updates. Microsoft later said the issue was resolved in KB5124012 and newer updates. The company also pointed customers to the Auto Super Resolution Package as a temporary workaround.

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Timeline

  1. 11.09.2026 12:39 2 articles · 1h ago

    Windows update KB5124012 resolves Teams and Outlook launch failures on ARM devices

    Mitigation Patch Update

    Microsoft said Windows updates released September 8, 2026 (KB5124012), and updates released after that date, resolved a bug that could prevent Microsoft Teams and the new Outlook for Windows from launching or could cause them to close unexpectedly on ARM-based Windows devices such as Surface Pro 11 and Surface Laptop 7. The company recommended installing the latest update for the device.

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  2. 11.09.2026 12:39 1 articles · 1h ago

    Microsoft warns Teams and new Outlook may fail to launch on ARM Windows PCs

    Initial Disclosure

    Microsoft said that after Windows security updates released on or after August 11, 2026 (KB5121003), Microsoft Teams and the new Outlook for Windows might fail to launch or might close unexpectedly on ARM-based Windows devices, including Surface Pro 11 and Surface Laptop 7. The issue affected Windows 11 24H2 or later devices that had not installed Microsoft Store updates, and Microsoft advised updating the Auto Super Resolution Package as a temporary workaround.

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