Installing Word 2003 won't add menus to Word 2007. You can have both
programs on the same machine simultaneously, but they don't share
menus. (And if you want to do that, uninstall Office 2007 first;
install 2003, and then custom reinstall 2007 and tell it not to remove
2003. Also see http://pubs.logicalexpressions.com/pub0009/LPMArticle.asp?ID=762 for a
way to minimize interference between versions.)