Account should be Exchange (EAS)
Incoming mail server is usually a https address - very rare (and a bad idea) to use non-encrypted connections for Exchange e-mail
Domain is your logon domain (should be visible on machines connected to the work network in the logon box)
Username may not match your e-mail address - it should be your network username.
Password - well, yes, this one is obvious.
There are some issues around server-side security policies, but if iPhones are working, then it would suggest those policies are not in use on your network.