http://www.nytimes.com/2004/07/20/technology/20CND-GATES.html

Microsoft generates roughly $1 billion in extra cash each month. “I don’t know any company out there that generates that kind of excess cash,” Mr. di Bona said.

Could this, by any chance, have anything to do with the company having a monopoly in 3 markets – operating systems, office productivity suites, and web browsers?