Hi i want to create user groups in exchange 2007. at the moment it shows all the users under the global addres book, i want to show only the addresses related to perticuler user group. how do i do this. i want to use this to host like 3 domains. i want to seperate users for each domain.

You'll have to create 3 address lists, if you want the users to be able to see all 3. Otherwise, you'll have to create new AL's, and set a lot of permissions.