They did use it. Windows, the operating system choice of terrorists.
Another poster claims the best selling book on OBL says they use Macs.
http://www.freerepublic.com/focus/f-chat/1793048/posts?page=69#69
Either way, simply using a product out of necessity is not the same as giving it your full endorsement, or creating a version of your own, as all communists governments do with Linux. Why you try to cover it all up is the only question.