Earlier quoted context omitted.
No, they actually all use windows!
Microsoft has a very strong technology evangelizing program targeted at upper education. They almost pay colleges to offer Windows-centric courses and Windows-only labs. The Linux users generally consider OSX a nice Linux-like OS that lacks a decent package manager ;-) Much like Microsoft, the hardware is great. Disclaimer: I am mostly a Linux user who also uses Macs for certain tasks.
Many of my teachers eventually would relent and realise that yes I was right. TCP/IP is one of the classes I took in which Windows was required. TCP/IP is a network protocol, it is available in all major OS's. I turned in entire assignments with a simple note "Windows required, don't have Windows." Luckily I didn't end up getting docked points because they realised I already knew all of the information in the course.
One thing that was really nice, and I am surprised none of the teachers used it against me was the fact that with MSDNAA I as a student had access to thousands of dollars worth of Microsoft software. You name it I could download a free legal copy of it for use during my tenure at college as a student. Microsoft seems to have that on lock. What better way to get students to play with your platform than to have them use all your tools and software free of charge. Windows 7, Visual Studio, SQL, SharePoint, Exchange and others.