Microsoft works to resolve Teams and Outlook launch failures on ARM‑based Windows PCs

Microsoft has confirmed a problem that prevents its Teams collaboration app and the new Outlook client from starting on ARM‑based Windows devices, with many users experiencing crashes after recent updates.

The glitch appears to be linked to the cumulative updates released in August 2026 during the monthly Patch Tuesday cycle. Since then, owners of hardware such as the Surface Pro X and other ARM laptops have reported that the applications become unresponsive immediately after the update installs.

Microsoft says its engineers have pinpointed the update as the trigger and are preparing a corrective patch that will be rolled out in upcoming releases. In the meantime, the company advises affected customers to revert to the legacy Outlook version or to use the web‑based Teams interface as a temporary workaround.

The incident underscores the challenges of moving Windows software to the ARM architecture, which promises better battery life and always‑on connectivity but requires developers to adapt code for a different instruction set. While Windows 11 on ARM has expanded its app compatibility this year, the current issue shows that some native components still need fine‑tuning.

Industry observers warn that prolonged disruptions could impact corporate productivity, especially for firms that rely heavily on Microsoft’s cloud‑first communication suite. If the fix is delayed, organizations may look for alternative solutions or pause further migration to ARM devices. Microsoft has not provided a precise timeline but expects the problem to be resolved before the next Patch Tuesday in November.