Thank you all - I sent an e-mail off to our technology coordinator two days ago and have still heard nothing in reply. If we didn't share her with two other buildings, I'd simply just walk down to her office.
As far as I know, everything on my end is all correct. It keeps telling me it cannot verify my account information, despite knowing I have the correct server address, username and password all typed in. I don't type the domain in because it's optional.
What is so frustrating about all this is that I had my work e-mail set up on my iPhone last year, but got tired of hearing my phone go off all the time and since I am a teacher, I didn't feel it was necessary to be available by e-mail 24/7. Now I want it on my iPad 2 because it goes everywhere with me, inside and outside the building, and it would be nice not to have to log in through the web every time I want to access it.
I'll keep plugging away with all your advice and keep my fingers crossed that someone in this building remotely cares and actually answers my questions!