What total hypocracy there! You are preaching about how great a pc is without providing real evidence. Plus how dare you to say to others what a fanboy they are. Now I am all for PC, i actually own a PC server that fits nicely on my rack (A 1U size!!!), I use it as a basic NAT server and for compiling i386 architecture programs (NOT WINDOWS!!) but i would not dare to install windows on it. Only end users, like yourself, use windows and mac os x. As most computing technology are servers and researched based, they need stability and reliablity that windows cannot offer. Also, most computers are not windows based. Therefore it has a higher compatibilty ratio in the open source world.
Mac OS X is a far more advanced operating system as it is a version of freebsd, a unix os and much older than Windows. Most super computers are ran off POSIX standard operating systems, one very similar to that of what a macintosh uses.
To start off, if you are implying that super computers are running windows, guess again! If there is any operating system that is terrible in security and such a resource hog, it has to be windows. Wow! you obviously do not know what you are talking about onewecallgod.