it’s a bit disingenuous to think that corporations are using windows just because employees are familiar with that. Unless the work is only using a web browser, you need programs and stuff, you don’t simply switch to Linux. Especially when “familiar with windows” for an average employee it just means “know where the icons are, and open Facebook in a browser”.
A corporation would surely love to save $100k if they could just have a windows skin on Linux and force employees to watch a 1-hour video on training to use the new system. But then if they need to run [PROGRAM X]? and if they need to run [PROGRAM Y]? And what if some quirk of running [PROGRAM Z] on Wine introduces some bug that causes slowdowns and monetary loss?
They intentionally choose windows, and they will pay whatever Microsoft tells them because:
they can have support from less specialized (=cheaper) techs
they can control everything of their computers from a centralized position. If they want, they can force push the goatse image as the wallpaper on each single employee and nobody could change that.
it works well with the programs they use, and they are in a configuration that can be supported by techs