If you previously had Office 2007 installed on a broken computer, you can recover the key using free software like (by NirSoft) or Magical Jelly Bean KeyFinder . You must run this on the original hard drive. This is the only legal way to retrieve a key from a "list" of one.
Microsoft Office 2007 product keys act as unique licenses that validate a user's right to the software. During installation, the system requires this key to unlock advanced features. Without a valid key, the software typically enters a "Reduced Functionality Mode" ms office 2007 product key list