Microsoft Office 365 does not work with macOS 26

Just updated my M3 MacBook Pro max to the new Tahoe - but now none of my Microsoft apps (Word, Excel etc fail to work). I've since binned these, re-purchased a new 365 subscription today and downloaded / installed and updated all apps, but no - they quit as soon as I open them. Anyone else having this? Currently I'm stuck..


[Edited by Moderator]

MacBook Pro 16″, macOS 26.0

Posted on Sep 17, 2025 8:30 AM

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Posted on Sep 19, 2025 1:47 AM

I had the same issue. I contacted apple support, here was their solution: Restart Mac in Safe Mode, relaunch the Apps. If trouble free, then restart again in Normal mode. Safe mode clears the caches and performs systems checks that seems to have resolved the problem for me.

26 replies

Sep 17, 2025 8:43 AM in response to chrishall9909

MS 365 is running fine on my M4 Pro MacBook Pro under macOS 26 Tahoe. I was running 16.100.4 initially and updated (via Microsoft Auto Update) to 16.101. There was a minor issue reported by someone else on this board that was resolved by that update.


Thus, this does not appear to be an issue with macOS. You might try your question on the Microsoft Forums:

https://learn.microsoft.com/en-us/answers/tags/831/m365-office  

Oct 6, 2025 2:52 PM in response to chrishall9909

Go to https://learn.microsoft.com/en-us/officeupdates/update-history-office-for-mac and use microsoft's current updates. I had the same problem until I found this site. It will open the program and documents but there may be a note at the top that you need to "activate" it. If so, go to your microsoft account, click on your previous purchases and it should reactivate.

Oct 6, 2025 6:18 PM in response to eugeneclaase

eugeneclaase wrote:

I have the same issue. I tried the method above, restarting in Safe Mode, opening all the apps, which worked fine (in Safe mode). Restarted in normal mode, and the issue still persists.

That most likely indicates you have some other third party software installed which is causing a problem. The usual culprits for interfering with the normal operations of macOS are:

  • Anti-virus apps
  • Cleaning/Optimizer apps
  • Third party security software


None of these types of apps are needed on a Mac. Uninstall them by following their developer's instructions.

Microsoft Office 365 does not work with macOS 26

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