We are running in an Exchange 2003 environment.
Clients are mainly Outlook 2003 with some Outlook 2007.
I hear that Outlook 2007 has a feature called Autodiscovery which enabled it to automatically connect to Exchange servers as opposed to entering one in when creating the profile.
I'm not sure if this feature only works if you have Exchange 2007 servers though, and can't find a definitive answer on the MS sites.
Could someone please confirm (pref with MS link)