Why Ms choose this?Will the final version also not work with windows 2000???

Sorry buddy, win 2000 is old. You must get XP or Vista when it comes out :-( :-)

Yeah, I've seen it stated that FSX will require WinXP SP2 or higher(Vista) to run. Why? I don't know for certain. Probably because the sim needs to hook into certain libraries/routines only available in those newer versions of MS Operating Systems. I guess you could say it looks like Win2000 is beginning to show it's age. It IS the year 2006 now and Win2000 is 6 or so years old, which is considered to be pretty darned old in the pc realm.Regards