Think about it. LindowsOS is only $500 for an educational site license. You can install it on as many computers as the institution owns. Here at Carolina there thousands of computers owned by the university, 99% of which are running Windows. We have a gigantic licensing deal with Microsoft, which I am positive is way, way more than $500.
Think about it. Think about the financial hold MS has on universities. Just think what we could do with that money. Think about the money that could be used on academic programs. We could give more scholarships, buy more books, hire more professors (or pay current profs more!), or create new programs.
Think about it.