You'll have to use Windows—it's a fact of life (at least at the moment).
If you're not forced to use Windows as the desktop OS of choice in your workplace, then there's a good chance there's going to be at least one Windows server you have to babysit or manage.
Windows still sees common installations for the following reasons:
- Active Directory
- Email with Exchange
- File servers
It's also used in the wider server world, with software like IIS holding a sizeable (though much smaller than open source offerings) chunk of the web.
Right from the off, and as we talked about previously, Windows and Linux differ in some key ways.