You work in software. I work in enterprise IT. You have no clue what you're talking about. The server industry is dominated by Windows. Walk into any company on the planet and I 100% guarantee you they have an AD environment. I guarantee you the vast majority of computers you will find in their offices are Windows boxes connected to that AD environment. Their email is going to be run by Exchange most likely. So you've got at least two Windows clusters right there. The applications they run probably also live on a Windows server somewhere and all of this is probably sitting on top of VMWare. You clearly have no idea what you're talking about if you think you can walk into a data center and 96% of the servers there are running Linux. That's delusional.