I frequently get the following questions. Here are the answers...

Q: Does Office 2007 run on Windows XP:

A: Yes it does. It runs on Windows XP and Windows Vista. Here are the requirements.

Q: Is Open XML supported by other version of Microsoft Office?

A: Yes. Open XML is support by Office 2000, Office XP and Office 2003 using the Microsoft Office compatibility pack.

Q: Is Open XML support by any Mac versions of Microsoft Office?

A: Yes. Open XML is support by Microsoft Office 2004 and 2008