The August 11 Microsoft update causes Teams and Outlook to no longer start on ARM-based PCs.
Microsoft’s new security update has caused Teams or Outlook on Arm-based PCs to potentially close unexpectedly. “After installing Windows security updates released on or after August 11, 2026 (KB5121003), Microsoft Teams and the new Outlook for Windows may fail to start or close unexpectedly on ARM-based devices, such as Surface Pro 11 and Surface Laptop 7”, writes Microsoft. The company is currently working on a solution in a future Microsoft update.
Microsoft update
“Classic Outlook, Word, Excel and other applications are not known to be affected. This issue is likely to occur on newly installed PCs that have not yet installed Microsoft Store updates,” the message reads. Earlier this week, Microsoft Outlook experienced a temporary outage.
The current issue affects Windows 11, version 26H1; Windows 11, version 25H2; Windows 11, version 24H2. Users can resolve this issue by clicking on Get updates in the Microsoft Store via Library to subsequently install the latest update for the Auto Super Resolution Package (version 1.0.19.0 or later).