This is what MS has been doing for years, no one uses MS products for a stable quickly recoverable environment. Not Google, GE, or any other big company. MS thrives on small to medium businesses because of it's dominance in the market, and it's ability to offer every product a business would need. They make their products so easy a monkey could set them up, but so profitable that only MS employees can manage them efficiently with inhouse tools.
As I recall, a lot of large companies use MS Windows and MS Office for their standard user desktop. They might not use it for the software that runs their enterprise but they are still paying MS lots of license fees... In this sense, I think MS also "thrives" on large companies...
