Nitpicky point, but Steam figures should never be used to represent the whole consumer market. Gamers are more likely to have new rigs or want to play games that already don't support XP. I suspect XP users a more likely to be users with simple needs who have a system that works for them and don't want to chance. For that matter, Photoshop isn't likely to sway them either. Google Apps maybe, if it includes Gmail -- but damn if that doesn't miss the point of using webmail in the first place.