After installing Microsoft Office 2013, you can get this error message when trying to activate the software:
Your copy of Microsoft Office 2013 cannot be activated because the specified Product Key has already been activated the maximum number of times permitted for your software license as specified in the Microsoft Software License Terms. For details about the maximum allowed number of product activations, click Help, and then search for “Read the Microsoft Software License Terms”.
If you believe that you are getting this message in error, click Back and chose the telephone option. The telephone activation option will provide you the opportunity to speak to a support representative about activation issues.
Basically this is telling you that your copy of Microsoft Office 2013 has been activated with that Product Key too many times. If this software is on the correct number of computers and you are just reinstalling it (say, because you had a problem with the computer), click Back and chose the option to activate Microsoft Office 2013 over the phone. They will give you a code that you can use once you have confirmed that you’re using the software within the Microsoft Software License Terms 🙂
If you have bought an alternative Product Key to cover the extra licences, you can just change the Microsoft Office 2013 Product Key and reactivate the software.