Spending $50,000 just to ensure they were complying with CAAST license warnings is enough to make anyone reconsider their IT strategy; Winnipeg's Sisler High School posts a detailed case-study in transitioning their computer lab to run with GNU:

Public school systems always are underfunded, and because we are using taxpayers' money, we have the responsibility to get the most for our money. By using a Linux terminal server with cheap, "obsolete" thin clients, I have been able to deliver many computer courses that are fully compatible with if not better than what teachers using Microsoft Windows are offering. With the money saved on a Linux terminal server lab, the school can fund other subject areas.

[ Source: A Computer Lab with No Windows, Part I ]