I copied the following from an article link on the UT main page titled "Steve Ballmer on .Net":

------ start excerpt (italics inserted by me)
interviewer: Are small and medium-sized businesses becoming much more important to Microsoft?

Steve Ballmer: They have always been important. There are some people outside of Microsoft now realizing how important they are. It's the biggest part of the market. The biggest part of the market is not the enterprise or the consumer market. It's small and medium-sized businesses.
------ end of excerpt

To me the conclusion is obvious!