If anyone can give me some guidance on the following it would be greatly appreciated.
I am implementing an online testing platform at my school. I have successfully installed the software. The software runs smoothly as an internal web.
Now I am thinking of installing exchange server to run an internal email system as well as an internal personal messenger system.
Has anyone ever done this, if so, is there anything you can tell me about in advance that may cause me grief? Issues etc.
Also, any decent links to white papers (I am not particular to MS white paper docs) would be very much appreciated.

For example, a recommended book would be great!