Our sites IT infrastructure is based on Debian GNU/Linux. Debian is used for almost all of the servers at our site. This includes web servers, mail servers, file servers, print servers and other services.
Also the majority of our desktop systems are running Debian. That includes about 30 PCs used as public workstations for students, and about 40 PCs as workstations for our staff.
The ease of use and its maintainability as well as its stability makes Debian GNU/Linux our first choice.