Originally Posted by kalniel 
So the limit of 3 per household or whatever just kind of went over your head?
Actually it was fairly clear you were allowed 3 of EACH VERSION and probably meant per household but in reality most stores probably wouldn't have honoured more than 3 of each version but MS are unlikely to bother checking various orders across various stores and stop you getting more than 3 of each.
But even by their rules, 6 copies is fine. I was very very tempted to do the same in so much as get 3 at two places to make sure, or try to make sure I definately get at least 3 copies for the families computers. In the end I think I only got 3 copies, only home as professional really offers nothing extra.