You will probably need to do the following:
1. Make sure client for Microsoft is on all the administrative network computers. (In addition to the client for Novell)
2. Make sure each administrative network user has a login and mailbox on the domain containing the Exchange server, or, alternately, has a login and mailbox on the Exchange server computer.
3. In Outlook, on each of these computers, make sure the computer can find the Exchange server by name. Depending on your browsing setup and routers, if any, this may require an entry in the LMHOSTS file or HOSTS file on each computer. Having found the server, verify the mailbox.
4. For automatic logins to Exchange, the username and password the user logs on to his computer withmust exactly match the username and password on the domain or Exchange server, and in the mail profile, under Exchange Server properties, Advanced Tab, NT Password Authentication should be set in the Logon network security box. If you explicitly assigned passwords in the Exchange server, or the mail and login passwords are different, then this box should have Distributed Password Authentication set, and the user will get a pop-up login box when starting Outlook.
Good luck