The Microsoft Office 2010 product key prompts your copy of Office 2010 to its premium version. A product key, or activation key, is hence a series of letters or numbers you need to supply to activate a program.We have like 20 Office 2010 Product Key Boxes but we have no clue which one are used and which one are free. Determine which software product a Microsoft Product Key activates (6 answers) Closed 4 years ago.This is how you can easily find Windows product key from external hard drive. Step (3): Once you’ve clicked the OK button, the Windows product key finder software will load the selected registry file and then immediately show product keys for Windows, Microsoft Office, SQL Server, Adobe and many other programs you’ve ever installed.