Quit all Office applications. Trash the files listed below and then re-launch Microsoft Word. Your copy of Office will act as if it has been reinstalled and allow you to enter new serial number and registration information.
/Applications/Microsoft Office 2004 (or X)/Office/
- OfficePID (normally an invisible file)
To show Inivisibles, this application works well:
- Carbon Registration Database
- Office Registration Cache
- Microsoft Office Settings
Trash all above and then launch any Office application. You will be asked to input the new serial number.