Right, here is what I do:
1. Type in the email address at the top:
hesan@sussexxx.com
2. Leave the Domain blank (as its optional)
3. Username: I put in the email username
4. And add the password
I then click on Next.....
Then another field, "Server" appears underneath the "Email" field. I then place in my server details, which is: mail.domain.com (in this case for instance mail.sussexXX.com).
I then click on Next and this is the error I get back:
Exhange Account: Unable to verify account information.
This happens every time.
Hesan