LDAP public address books for specific mailusers

[ilya_rt]

Hi!
I have RC under my domain example.com with IMAP server provisioned  from same LDAP server as adderss book storage. I have 2 logical groups (let's say divisions) of mailusers under my domain example.com. Address book is shared between all users. What I need is to make address book group available to specific group of users. Mailusers are members of LDAP groups already. Anybody know how to make this?