I'm trying to connect to my Exchange account via OS X, but nothing seems to be working. It keeps saying "Unable to verify account information". I tried following the help wizard, but even when it leads me to get the POP server, it's just listed as "Not available". So it would seem the server is set up to not allow Exchange syncing. But on the other hand, I do have it set up and working fine via Mountain Lion. Is there any reason this shouldn't be working?