Other than rebooting to finish installs (MS still can't get that right, but they're getting better), my Win2k box has never gone down. My all time best uptime between reboots is about 4 months.

Admittedly, I've had over a year uptime on my Linux box, but I use it a lot less intensively. All in all, Win2k is probably the most stable thing ever to come out of MS.

My gripe with MS is not with their products. It's with their predatory and monopolistic marketing behaviour -- including their not-quite-standard implementations of standards.