As for FOIA, they were never bound by the FOIA, since they are not a part of the US Government. If you tried to sue them and use discovery to gain access to their records, that was not possible since they were already covered by Section 2(b), which protects them from judicial processes.
This is insidious in that for less than $50 per Full Time Employee (FTE), the campus can install the OS, Office, and a large number of applications ON EVERY MACHINE. However, whenever this runs out, they have no software that they can use, so unless they have completely transitioned to non-MS software during the last year of the agreement, they have to renew.
The other side of the problem is that there are applications that will require them to use Windows and even MS Office. Some of this are back-ground programs you will never know about
However, all hope is not lost. First, since lab computers don't have to pay for licenses, it can be argued that they are freebies, and not using them is not wasting money. You can then start trying out alternatives there. This can also be done in smaller departments which will not see as much money lost by not using licenses off the Campus Agreement.
Also, Campus Agreements can be negotiated by department. Therefore, you can see if some departments can be exempted completely from having to participate. You can then show them how much they would save by going with the FOSS options, as compared to being forced into the MS CA.
Finally, look for departments with lots of Macs. While they are often hooked on MS Office for the Mac, they are usually more open to alternatives. Showing them NeoOffice or OO.org on OS X can be a first step for them.
As in all things, here is what you need to remember:
Remember, you want to help them, you want to help students, and they want to help students. Therefore (paraphrasing Jerry Maguire) you are trying to help them help students.
Good luck to you.
Life is a game. Money is how we keep score. -- Ted Turner