King0770-Notes-Access GAL from Clients 6.0
If your users prefer to use client apps like Thunderbird, or Mac's Address book but still needs to access the Zimbra's GAL, here's a proposed workaround.
Configure Client
Disable LDAP anonymous connections
/opt/zimbra/libexec/zmldapanon -d
Example for a Zimbra server called mail.abccompany.com
The settings would have something like this:
Server: mail.abccompany.com
Search Base: ou=people,dc=abccompany,dc=com
Port: 389
Scope: subtree
Authentication for a user with the address of joe@abccompany.com
uid=joe,ou=people,dc=abccompany,dc=com
password: _zimbra_password_
Authentication Type: simple
Outside Company's Network
If a user has the need to access the GAL from outside the company network, most likely port 389 will need to be accessible.