We are using Ex2010 SP1 now with FIM. Going to update to SP2 in order to have address book segregation. Is it possible to achieve the following using Dymanic Distribution group or others? Users in A domain, B domain and C domain will fall into one of the 3 groups: - Group 1 see all 3 groups - Group 2 see one of the address books - Group 3 special limited viewKelvin Teang

Hi Kelvin, I think you can use address book policy to do that: Understanding Address Book Policies http://technet.microsoft.com/en-us/library/hh529948.aspx Thanks, EvanEvan Liu TechNet Community Support