Open Office 2007 Files on a Mac?

[Joshua Lutes]

Hey guys,

My friend has a Macintosh computer and Word 2003.  I've looked on the
internet but can't find a plugin for Word 2003 on the Mac that will
let it automatically open Word 2007 files.  Is there a way to do this?
 I know that OpenOffice.org will but I'd prefer that she not need to
use additional applications (besides which the conversion for OO.o
isn't perfect).  Thanks,

Joshua