I have LDAP setup and being used with Squid for internet sharing.

Intially When I have setup Zimbra.I configured it for authentication from my LDAP. But I realised because of load of proxy server on LDAP degrading preformance of Zimbra.

I wish to setup Zimbra LDAP and wish to know if it is possible to mirror External Ldap to zimbra ldap and also Can I keep them synchronised?.

Let me know if insufficient details/ ambiguous.