How do I re-activate Microsoft Office 2021 perpetual license.

Paula W 20 Reputation points
2026-08-03T13:31:35.5866667+00:00

Hello,

I purchased a perpetual Microsoft Office Home and Business 2021 for Mac license and the license suddenly deactivated. I have tried reinstalling from My account on the website but this has not worked.

I have a Macbook Air OS version Tahoe.26.5

Any insight would be appreciated.

Microsoft 365 and Office | Install, redeem, activate | Other | MacOS
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Answer accepted by question author

DaveM121 915.1K Reputation points Independent Advisor
2026-08-03T14:07:12.6866667+00:00

This problem is most likely caused by the July 13 update, many people are experiencing problems with the Office apps on a Mac after that update..

1

Use the steps provided on this link to remove the Office licence from your Mac.

https://support.microsoft.com/en-us/microsoft-365-activation-licensing/how-to-remove-office-license-files-on-a-mac

2

Then, use this process to completely uninstall the Office apps from your Mac.

https://support.microsoft.com/en-us/office/lifecycle/officeinstall/uninstall-office-for-mac

3

Then, go to your Microsoft account on this link to download and reinstall Office.

https://account.microsoft.com/services/

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