You would need a mail client that is compatible with Exchange. If your
downloading mail from the server to the client then POP3 could be used. If
the mail needs to stay on the server it maybe mapi or what ever Exchange
Check to see what your client and Exchange support.
> We have several Unix users, and they want to access the Exchange Server
> like they access their Sendmail server. Is there a way for them to
> access their Exchange Server mailbox without using OWA and without using
> Internet Browser?