Linux runs the vast majority of servers and is the core technology behind Android that runs a lot of smart phones and is arguably the core technology behind Apple's MacOS. No one who has deployed any sort of scientific computing or number crunching uses freaking microsoft products. They are a joke.

I run linux and constantly run simulations on my workstation. I haven't launched windows in quite some time, even for games. To be honest it is MS windows that is the odd man out.