A critical bug in Microsoft’s Teams and Outlook applications has been fixed, resolving a frustrating issue affecting users of ARM-based Windows PCs. The problem, which prevented these applications from launching after installing recent security updates, has been plaguing users who rely on their devices for work and communication.
The bug specifically targeted users running Windows 11 version 24H2 or later on ARM-based devices such as the Surface Pro 11 and Surface Laptop 7. After installing the August Patch Tuesday update (KB5121003), users encountered issues with Teams and Outlook, which would either fail to launch or close unexpectedly. While other applications like Classic Outlook, Word, and Excel were not affected, this issue was particularly troublesome for those who rely on these apps for daily productivity.
Microsoft has attributed the problem to an underlying bug that was introduced by recent security updates. Although the exact cause remains unclear, the company has provided a temporary workaround: updating the Auto Super Resolution Package (ASRP), which is used to enhance gaming performance on Copilot+ PCs. However, this fix only addresses the symptoms rather than resolving the root issue.
Fortunately, Microsoft has now released a cumulative update that fixes the bug and provides critical security patches. The September Patch Tuesday updates (KB5124012) have resolved the issue for users, and it is essential to install these updates as soon as possible. As with any software update, this patch contains important improvements and resolutions beyond just fixing the Teams and Outlook bug.
This incident highlights the ongoing challenges of implementing large-scale updates in modern operating systems. In recent months, Microsoft has faced several issues caused by its August Patch Tuesday updates, including problems with printing and PDF exporting in apps using the Windows Presentation Foundation (WPF) UI framework. The company has also rolled out fixes for gaming-related bugs triggered by peripherals with built-in RGB lighting.
For users affected by this issue, installing the latest update is crucial to resolve the problem and ensure that Teams and Outlook function as expected. This serves as a reminder of the importance of staying up-to-date with software patches and updates, not only for security reasons but also to prevent potential disruptions to productivity.
In light of these events, it is essential for users to prioritize updating their devices regularly. While this may seem like a mundane task, it can help mitigate the impact of similar bugs in the future. By doing so, users can ensure that they have access to secure and reliable applications, without interruptions or unexpected crashes.
Source: Bleeping Computer — 2026-09-11