You mention that you want to get away from Novell, but interestingly enough, your solution may be a Novell product. Novell has a product called OpenExchange Server, which is powerful and versatile enough to run on its SuSE Linux. It also works with all types of clients and, unlike other Windows products that are reliant on Active Directory and can't use LDAP, it actually uses LDAP, which is supported by Solaris, GNU/Linux, and FreeBS.
If you're not really looking for this type of e-mail solution, why not look at Novell's eDirectory LDAP solution? Here is the link. If you absolutely want to get away from Novell, here is a nice link for everything you want to know about OpenLDAP.
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