I'm not technical and hope you get a more proficient answer but from what I do know Word and Excel files will automatically convert backwards and forwards to different versions but that's if you have MS Office packages installed - which you nearly always have to buy separately. How did your husband get Office 2007?
The OS eg Vista is irrelevant and Windows 8 is the common OS on new laptops etc. They also come installed (I think) with something similar to Office but not Microsoft and free, I don't know if you can open Word and Excel files in them but probably you can.
Anyone else???