docx file converter

In my other life, I teach computer courses and accept assignments through an online course management system. Our school (and myself) have yet to upgrade to Office 2007, but students aren’t wasting any time. I found an official Microsoft converter for Office 2007 formats available here:

http://www.microsoft.com/downloads/details.aspx?displaylang=en&FamilyID=941B3470-3AE9-4AEE-8F43-C6BB74CD1466