It's often hard to tell which mega-company is really ruling the world. Sometimes it seems like Google has taken over, but then there's always old standby Microsoft waiting in the wings, ready to pounce with a new product or platform that will eventually leave all others in its wake. Founder (and ultimate computer geek) Bill Gates has become, depending on whom you believe, an embodiment of the American Dream -- or a cautionary tale of corrupting power. How much do you really know about Microsoft, from its humble beginnings to its current incarnation with 89,000 (!) employees?