A Critical Bug Fixed: Microsoft Resolves Teams and Outlook Launch Issues on ARM-based Windows PCs
In a timely update, Microsoft has addressed a long-standing issue affecting users of its popular productivity apps, Teams and Outlook, on certain ARM-based Windows devices. The bug, which prevented these essential tools from launching after installing recent updates, has been resolved with the release of new Patch Tuesday cumulative updates.
The problem specifically affected users who run ARM-based versions of Windows 11 (24H2 or later) on devices like the Surface Pro 11 and Surface Laptop 7. After installing security updates released since August 11, 2026, many users encountered issues launching Teams and Outlook, with some experiencing unexpected closures. Thankfully, Microsoft has now fixed this issue in KB5124012 and subsequent updates.
This is not an isolated incident; it’s part of a larger trend where recent Windows updates have introduced bugs on various aspects of the operating system. For example, earlier this month, Microsoft confirmed that August .NET Framework updates were causing printing and PDF exporting issues in apps using the Windows Presentation Foundation (WPF) UI framework.
Moreover, other problems have arisen from these updates, such as gaming issues triggered by peripherals with built-in RGB lighting and errors related to EXCEPTION_ACCESS_VIOLATION. In some cases, users even received false alerts that their Microsoft Defender Antivirus had been turned off after installing recent patches.
Microsoft’s resolution to this particular issue was a temporary workaround: updating the Auto Super Resolution Package, which enables Copilot+ PCs to use AI for smoother gameplay. However, with the release of KB5124012 and subsequent updates, users can now breathe a sigh of relief as their Teams and Outlook apps should launch without issues.
As a user, it’s essential to stay informed about these types of updates and be prepared to take action when necessary. When installing new patches or updates, always keep an eye out for any known issues or workarounds mentioned by the manufacturer. In this case, updating your device with the latest Patch Tuesday cumulative updates should resolve the problem.
To avoid similar situations in the future, it’s crucial to maintain a secure and up-to-date operating system. Regularly check for software updates, and consider setting your devices to automatically update whenever possible. This proactive approach will help ensure you’re always protected against emerging threats and minimize downtime caused by unforeseen bugs.
Source: Bleeping Computer — 2026-09-11