Use free utilities like ProduKey or Belarc Advisor .
How to find product key for Microsoft Office already installed ms office 2007 product key list
If you purchased a retail version, your key is typically found in one of three physical locations: Use free utilities like ProduKey or Belarc Advisor
: Utilities like NirSoft ProduKey can extract keys directly from the system. you have limited options.
If you have the physical CD but lost the key (the sticker on the back of the CD jewel case or the manual), you have limited options.