A Windows 11 update appears to break Microsoft Teams and Outlook on Windows on Arm PCs. Issues started popping up after the rollout of KB5121003, which began shipping this month on Patch Tuesday.
Brian Stringfellow shared details about the problem through a Microsoft Learn report. Several people in that thread have similar issues.
PCs affected by the issue, including Stringfellow's Surface Laptop 7, see Microsoft Teams and Outlook close almost immediately after being opened. Specifically, the new Outlook is affected. Classic Outlook still works on PCs affected by the bug.
The problem seems to affect a variety of Windows on Arm devices. Julius Heng shared their experience:
"I have the exact same issue on Omnibook 3 running snapdragon. After the initial setup, Ms Teams works, but next day it doesnt work. It will have a white screen on teams and it will close right after it open. I tried various method, including reinstall webview 2 etc. None of it works. I tried to roll back all the update and it doesnt work. After did a factory reset Ms Teams works again. But to my dismay, the windows update itself and it breaks Teams again. right now, i'm back to square. Really hope that there's some way to rectify this."
It's not clear at this time why the issue is occuring or why the problem is limited to Windows on Arm PCs.
User Alex-L, who is listed as a moderator and Microsoft External Staff on Microsoft Learn, reported that similar issues are occurring on a variety of Windows on Arm systems:
"At this point, very similar symptoms on different Snapdragon/ARM64 systems. While these reports suggest a possible common factor, no one in this public forum can confirm Microsoft's internal investigations, determine the root cause, or verify whether this is a known issue affecting all ARM64 devices. Microsoft does not currently list a known issue for KB5121003 in the official release notes."
While we wait for official confirmation from Microsoft and a fix for the issue, users with Windows on Arm PCs may have to fall back to other versions of Outlook and Teams that are unaffected by the bug.
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