"Windows is a requirement because enough people grew up with it, not the other way around. If OLPC made a billion people grow up with Linux, Linux would be just dandy for business."
$100 laptop' embraces Windows XP
http://news.bbc.co.uk/2/hi/technology/7402365.stm
Hurm, I grew up using all sorts of different computers. Our first was a Tandy Trash 80, then Apple IIgs, then MS-DOS.
I think it's safe to say I feel comfortable on a variety of OS' from XP to OS X to Fedora.