I have a couple of boxes running winXP pro and another one running win2k adv server.. It's months since the last time i had to reboot them of any other reasons than hardware/software updates. I aint sure which one's the best though.

Following up delstars post here, i got to say that I've had alot af negative feedback concerning winXP, seems like it just won't work for some people. I don't know if it's computer or human malfunction though