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Mac is as already mentioned, mostly used for media working, articles, making professional movies etc. by the way it's an expensive solution.
Microsoft has made people so used to windows, everyone buys it now. There are good linux alternative, they just have to dare to change, because they arent so different as people think.
Linux vs Windows is like a pen vs a pencil. They basically do the same thing, they just work all different on the inside, which you don't need to care about anyway.
Linux is at the moment, mostly used on servers. Because it is so stable and stuff.
But you can run both on an older PC meaning you dont have to spend a shit load of
£Y€$ to get a stable server for FTP / Web /etc. as long as its got the CPU / RAM its needed an a little bit more it's all good mate.
Just a little warning, mixing up all different OS'es on one computer is BAD. I had Windows XP and Linux on one computer at once, was some unstable bad crap.
Stick to Windows if you feel ok with it; you don't really need to change. Also, if you play a lot of games, stick to windows
as most games are made for it.
I like people more than machines or money. But that's me!
Lets do something good and great: Lets do open source!