Magical Jelly Bean Keyfinder
The Magical Jelly Bean Keyfinder program is a free utility that retrieves product keys from the registry. It also has the ability to find product keys for Microsoft Office programs, along with product keys from many other non-Microsoft programs.
Advantages include very small size, ease of use, instant display of product keys, and multiple product key saving options.
Finds Keys for Operating Systems: Windows 10, Windows 8, Windows 7, Windows Vista, Windows Server 2003, Windows XP, Windows 2000, Windows ME, Windows 98, and Windows 95.
Finds Keys for Other Software: Microsoft Office 2007, Office 2003, Office XP, and several non-Microsoft programs.
The Magical Jelly Bean Keyfinder website says that this free key finder will find your Office 2010 product key but in fact, it does not, at least as of v126.96.36.199.