the reason why im using windows on the mac is because of compatibility, ive been using virtual dj for 4 years now and built up the database, now when i first got my macbook installed vdj, it doesnt recognise songs or playlists, or bpms etccc, so after a lot of forum searching, and people saying start again and youl have to reformate your drive, i just opted for putting windows on it, which a lot of people have done, and ive never had any problems with it up until now, but i have installed win7 64bit and all is good, i have never had any problems atall wen djing using windows xp vista or 7