Chances are, you may want to change the product key of your Mac Office 2008 upon finishing an update from their site because the product key used to install your Office 2008 installation used an invalid product key.

If after the update it does detect that an invalid product key was used, the office assistant will keep on popping up while the application that you chose to open will never be seen. To reset the product key, delete the following files and send to trash.

  • /Users/[username]/Library/Preferences/Microsoft/Office 2008/Microsoft Office 2008 settings.plist
  • /Applications/Microsoft Office 2008/Office/OfficePID.plist

[username] would be the username of your laptop. Run any Mac Office 2008 application and the office assistant will now have a textfield of the product key for you to input.

Mac OSX Lion users: here is a tip from commenter Tyson.

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