I need to enter a new MS Office for Mac license key.
How can I reset my old one?

3 Answers 3


From this forum post:

Ditch /Library/Preferences/com.microsoft.office.licensing.plist. Start any Office application. Reregister/reactivate.

Hope it helps.


To add to this, once you delete /Library/Preferences/com.microsoft.office.licensing.plist you then need to reboot. The activate office screen will then come up when you open any Office app.


This does not work if you switch computers, Office will complain that product has been used the maximum number of times.

One has to call them to reset activations.

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