5. 2003 - XP compatibility.
Powerpoint 2003 and XP are mostly very compatible, but one little thing came to light: if you re-size and crop pictures in 2003 and then open the show in XP, it can sometimes put the picture back to its original size, while keeping the crop positions so you only see a fraction of the picture. It's disconcerting, but easily fixable if you have time - pull out the crop marks and pull the picture back in.
Or, of course, you could just call us and we'll fix it for you!!