This utility will allow you to setup a shared GAL between the domains you choose. Please note, when you enter the domains, these domains will all share between each other, so all users on any domain will see all users on the other domains you have shared the GAL between.
You can get that information with this command: zmlocalconfig -s |egrep \"ldap_root_password|ldap_url\"
This is provided as-is, and is not endorsed by Zimbra.