Some quick comments:Email is your e-mail address: email@example.com or whatever
Server is the server name: owa.companyname.com or similar
Username (this is where things get a little confusing): normally in the form of domainname\username where username is similar to the first part of your e-mail address
Description: free text for you to describe the service (Work E-mail for example)
Use SSL: yes or no depending on whether you can or not - usually yes
I have it all set up on Windows Mobile and have tried it on my iPhone and it all works but I have all the settings to hand.
If you want to verify it, try the free service from Mail2web.com for a play around to see how it all works....
You only need to use username in the form domain/username if the server is a member server in a domain and the authentication is redirected to a domain server. If not just the username is enough.
SSL can be used when you can get through to the server on port 443 and sync with HTTPS which uses SSL (encryption) instead of HTTP (port 80).
SSL requires a certificate on the server - see previous post for explanation.
Thought I share some since this thread was what made it work for me.