Microsoft Resolves App Launch Failures on ARM Windows Devices

Microsoft has resolved a significant bug that prevented Microsoft Teams and the new Outlook for Windows from launching on ARM-based devices. The issue emerged after users installed security updates released in August 2026, creating a frustrating disconnect for professionals relying on these communication tools. The company confirmed that the problem specifically affected devices running Windows 11 version 24H2 or later, such as the Surface Pro 11 and Surface Laptop 7.

According to BleepingComputer, the failure was most likely to occur on new or freshly imaged computers that had not yet received updates from the Microsoft Store. While classic versions of Outlook and other Office applications remained functional, the modern web-based versions of Teams and Outlook would either fail to start or close unexpectedly. This disruption highlighted a specific vulnerability in how recent updates interacted with the underlying architecture of these ARM-based machines.

Workaround required before the fix

Before the official patch was deployed, Microsoft advised affected users to install an update for the Auto Super Resolution Package. This component is designed to use artificial intelligence to enhance graphics performance, particularly for gaming on Copilot+ PCs. Although the connection between gaming graphics drivers and office applications seems counterintuitive, updating this package served as a temporary measure to stabilize the crashing applications.

The company did not disclose the root cause of the bug at the time, leaving users to rely on this workaround. The situation underscored the trade-off often present in rapid software updates: while security patches are critical, they can sometimes introduce unintended side effects that break core productivity features. Users were left with a temporary solution that required manual intervention rather than a seamless, automatic repair.

September updates deliver the solution

Microsoft officially fixed the issue with the cumulative updates released on September 8, 2026, identified as KB5124012. The company urged users to install the latest updates immediately, noting that this patch contains important improvements and resolves the launch failures. This marks the end of a period of instability for ARM-based Windows users, who can now expect their communication tools to open reliably.

The resolution comes as part of a broader effort to stabilize the operating system following a series of bugs introduced in the August updates. The patch ensures that the integration between the Windows kernel and modern applications runs smoothly, restoring the expected user experience. For IT administrators, this means pushing the update to fleet devices to prevent ongoing productivity losses.

Pattern of recent update issues

This bug is the latest in a string of problems caused by Windows updates released in August 2026. Earlier this month, updates to the .NET Framework broke printing and PDF export functions in applications using the Windows Presentation Framework. Shortly after, a bug related to peripherals with RGB lighting caused system crashes and gaming errors. Additionally, some users reported that custom mouse and desktop settings were wiped after installing a specific preview update.

These recurring issues suggest a need for more rigorous testing before updates are rolled out to the general public. While Microsoft has addressed these specific bugs, the frequency of such problems raises concerns about the stability of the current Windows 11 release cycle. Users are advised to monitor their devices closely and keep their systems updated to benefit from the latest fixes and security enhancements.