"After installing 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 devices, such as Surface Pro 11 and Surface Laptop 7," Microsoft said in a Windows release health update.
Scope: which devices and applications are affected
Microsoft says the problem affects ARM-based Windows devices that run Windows 11 24H2 or later. The company named Surface Pro 11 and Surface Laptop 7 as examples of affected hardware. The failures primarily involve Microsoft Teams and the new Outlook for Windows: those applications "might fail to launch or might close unexpectedly" after installing security updates released on or after August 11, 2026 (KB5121003).
Microsoft explicitly noted that classic Outlook, Word, Excel, and other traditional applications are not known to be affected. The company added the issue is most likely to occur on new or freshly imaged PCs that have not yet installed any Microsoft Store updates.
Temporary workaround: update the Auto Super Resolution Package
Microsoft did not publish a technical root cause in its advisory. Instead, it recommended a practical, temporary workaround: update the Auto Super Resolution Package through the Microsoft Store. Microsoft described that package as enabling "Copilot+ PCs to use AI to make supported games play more smoothly with enhanced details."
The steps Microsoft provided are specific: open the Microsoft Store, go to Downloads > Check for updates, and install Auto Super Resolution Package version 1.0.19.0 or later. Microsoft repeated this guidance as a stopgap while it prepares a permanent correction.
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See what we buildMicrosoft is working on a permanent fix; this follows other August update problems
Microsoft said it is developing a permanent fix that will be released in a future Windows update. The company did not give a timeline for that release in the advisory.
This incident is the latest in a string of issues Microsoft has acknowledged since August. According to the same advisory set, Microsoft confirmed last week that August 2026 .NET Framework updates are breaking printing and PDF export in some applications. Days later, Microsoft began rolling out a fix for an issue where peripherals with built-in RGB lighting could trigger system crashes and gaming problems on Windows 11 devices, producing EXCEPTION_ACCESS_VIOLATION errors. On Friday, Microsoft also asked customers to ignore alerts claiming that Microsoft Defender Antivirus had been turned off after installing the latest Defender updates.
What this means for technologists, IT administrators, and end users
- Technologists and security teams: Review any ARM-based device images and update management workflows to ensure Microsoft Store updates — specifically the Auto Super Resolution Package version 1.0.19.0 or later — are applied before or immediately after applying August security updates. The advisory implies freshly imaged machines are at higher risk, so imaging pipelines should be checked.
- Affected enterprises and procurement leaders: Expect a brief operational impact for fleets that include Surface Pro 11, Surface Laptop 7, or other ARM-based Windows 11 24H2+ devices. Where possible, delay broad deployment of August security updates until the temporary mitigation has been applied across ARM devices or until Microsoft issues the permanent fix.
- End users: If you use Teams or the new Outlook on an ARM-based Windows PC and experience crashes or failures to launch after recent August updates, open the Microsoft Store and install updates — specifically Auto Super Resolution Package v1.0.19.0 or later — as the company’s recommended workaround.
Conclusion
Microsoft has acknowledged a narrow but disruptive problem tied to August security updates (KB5121003) that affects Teams and the new Outlook on ARM-based Windows 11 24H2+ devices, particularly new or freshly imaged machines that lack Microsoft Store updates. The company’s immediate advice is concrete and actionable — update the Auto Super Resolution Package via the Microsoft Store — and a permanent fix is pending in a future Windows update. For now, administrators and users managing ARM-based fleets will need to balance timely security patching against the simple prevention of application launch failures by ensuring Microsoft Store updates are applied.
Original story: Microsoft Teams, Outlook fail to launch on ARM-based Windows PCs — BleepingComputer
