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One issue sticks in my mind is can I replicate the Zimbra LDAP (possibly OpenLDAP master-slave) which would include the Samba LDAP (following the article above)? I am not interested in multi-server Zimbra. Just Single-Sign on for Zimbra and Samba and just a fairly straightforward way have multiple LDAP copies for Samba.
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Samba, Zimbra and OpenLDAP replication 
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