I did a quick search because I'm interested in this as well. The university I'm going to has the same kind of deal. We basically get a lot of M$ software for free. These two links look like they'd have some good info on setting up an exchange server but I didn't have a chance to read through them.
http://www.techtutorials.info/exchsetup.html
http://www.computerperformance.co.uk...03_install.htm