Another awful, irrelevant "fact post". All we need to do is start counting handheld electronic calculators and garage door openers as "PC's" and we'll knock ole MS down to 3%, eh! Hell, put a boing ball sticker on that electric toothbrush, Amiga is making a comeback!1!!!!1!1111!!! Apple sticker on a leaf blower surely makes it a computer!
http://en.wikipedia.org/wiki/Usage_share_of_operating_systems
