Microsoft Office Setup: Product Key
Product Key
Type the 25-character Product Key number. It is located on your Certificate of Authenticity or the sticker on the back of the CD case.
Note If you are converting a trial version of Office, you must use the Product Key from a full version of Office. Your full version Product Key can be found either on the package you purchased at a store or in the confirmation email you received after making your purchase of Office online.