Adding an Exchange Server to Novell

WE currently have a novell network running across three offices and were looking to add a Small Business Server to add exchange for e-mail. Right now we have a seperate win2000 server hosting our web on a DMZ. We will need internet e-mail access and I was wondering about location of the exchange server and then what I have to do to allow the clients to access it. Should I locate the server on the DMZ or on the LAN. Also, as far as login, what is entailed to allow novell clients to access the server. Thanks a bunch for the help.