E-mail clients, such as Eudora, Outlook Express, Netscape Mail, Pine, etc., cannot access MS Exchange via the default protocol (MAPI) created by Microsoft. Instead, they must access e-mail via POP3 or IMAP.
Alentus will supply you with the information that you will need to setup an IMAP client.
Note: POP3 access does not allow access to most features of MS Exchange. It only gives access to receiving and sending e-mail. Using POP3, you will not be able to share your calendar, folders, Public Folders, Global Address List, etc.