Global Address List (referred as GAL) is used for synchronization of all internal company contacts. If you use an external LDAP database outside Kerio MailServer (e.g. an LDAP database in Active Directory or Apple Open Directory), it can be subscribed to Kerio MailServer and then its contacts can be synchronized to the Global Contacts public folder in a single direction. Thus, users can access, in addition to all domain and Kerio MailServer user contacts, also contacts of any users from the external LDAP server.
To add a user or a group to the global public contact folder, go to the Kerio MailServer's administration interface, section Users or Groups:
Open the user/group edit dialog.
Go to the General tab (see figure 21.1 User edit dialog — publishing to the public directory).
Check the Publish in Global Address List option.