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


From this forum post:

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

Hope it helps.

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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.

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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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