Sales network is something entirely different than technical capabilities. Especially, when half of Microsoft is sales force.
Yes, there are companies using Microsoft products and Microsoft is getting paid very well for that. However, these companies are not on forefront of computing and are not considered to be top companies in the area of cutting edge development.
Show me some cutting edge company/startup in the IT sector that is using Microsoft products and is not a statistical error. There is a reason for that.