Uptime for more than a few months probably doesn't matter in most cases.You probably need to reboot your computer in that timeframe anyway e.g. to install kernel patches to keep up with security updates. If you need that kind of availability you should plan your installation in another way and add redundancy.

The important thing to most people is not if the computer is still running, but if the service it provides is available, and windows Vista most certainly can run for a few months, even old win NT3.51 could do that.

The advantage of Linux here is not that it can stay up much longer, but rather that it doesnt cost an arm and a leg in licence costs to set up some kind of fail-over system to provide uninterupted services if you need to reboot or get an hardware failure. Unfortunately the hardware still costs money though. /uno

You are right and you are wrong. Yes, it's true that Vista, XP or even Windows 2k are rock solid, but only as long as you don't add third party hardware driveres of dubious quality. Unfortunately many hardware venders don't spend as much effort as they should to develop good drivers. Just using the drivers that comes with windows leaves you with a rather small set of supported hardware, so people install whatever drivers that comes with the hardware they buy, and as a result they get BSOD if they are unlucky, and then they blame Microsoft.