I know a lot of people have posted about wanting to extend the Zimbra LDAP server for other authentication purposes.
I'm noodling this process out myself and wanted to run a few ideas the Zimbra folks and other forum readers.
What about the option of an external directory server that does referrals to the zimbra LDAP server for non-local lookups? Would something like this work?
I'm envisioning someway to overlay the Zimbra schema on top of another LDAP server where would have a separate ou for our customers and business partners.