My wife, Cathy Cheo-Isaacs posted an entry in her blog that addresses the age old issue of incompatibility regarding versions of Microsoft Office. I am continually asked to open files for students because they completed them at home using a different version of Office. For example, they may have Office 2007 at home, and our computers have Office 2000 or 2003. Whatever the case may be, Cathy provides the answer with a link to the Microsoft compatibility pack.
Visit her entry here.