Read Wired.com? Today their “this day in tech” is about Microsoft. Apparently Bill and Paul formed their partnership on the 4:th of April, 1975. I was one year old back then.
You’ll find the story here: http://www.wired.com/science/discoveries/news/2008/04/dayintech_0404
I can also recommend the book Accidental Empires, on the same subject – http://www.amazon.com/Accidental-Empires-Silicon-Millions-Competition/dp/0887308554/ref=pd_bbs_sr_1?ie=UTF8&s=books&qid=1207291860&sr=8-1