Yoshi, American companies may use Linux/Macs/etc instead of Windows, but until you've worked for/studied every computer based company in the world, don't make such claims that its more widely used. Different applications call for different systems.
I'm neither a Windows, a Linux nor a Mac zealot/fanatic, I just use Windows because theres absolutely no reason for me to switch. None whatsoever. There are a few reasons for me not to, however, the biggest one being compatibility. Another is time, cost, and effort. Why bother spending time and money (in the case of Macs, possibly Linux too with h/w compatibility) and effort, obtaining and setting up a different OS/System and then learn how to use it, when Windows is already here, is already perfectly compatible with everything I want/need and I already know how to use?
So, its not really down to a persons preference whether or not they run linux, or use a mac instead of a PC, its down to whether or not the system they have does what they need it to. Same with companies, only one company I've worked for has ever used anything other than Windows for its client machines - that was a graphics editing company who used Macs. Lloyds Bank uses Windows, Southern Water uses Windows. Small time English companies, Yoshi? Babel Media, the company I currently work for, uses Windows throughout - to test Mac games we rent Macs. We don't need them, therefore we dont have them.
Maybe Linux is more stable, maybe the Mac has... whatever it has... but a company won't switch just because they want to - they will because the system has something the company requires. Even then, it has to be a must-have to initiate such a change.
I've tried to keep this as level as possible, but I'm sure a zealot like Yoshi would be able to flame the hell out of an erroneous "1" in a binary string.
"Whats that for?" "Thats the machine that goes 'ping'" PING!
Q. How many testers does it take to change a light bulb?
A. We just noticed the room was dark; we don't actually fix the problems.
MCMF forever.