I know that when I install a newer version of office I can keep the existing version. 1) When I rebuild my laptop I installed Office 2007 (no previous version of office was installed). Can I now install office 2003 to co-exist with 2007? I teach at the professional level and oten I'm ask how to do something in a previous version (I don't want to go back prior to office 2003) that I've done in 2007 and it would be nice to have both on my system (I have the CD for both). 2) Can I have more than two versions of Office on a system, e.g. 2003, 2007, 2010?