I would like to create Address Books for my users. This restricts who they can PC to selected recipients a) by usergroup b) and/ or selected users. All users can contact admins. How I see it working is I have an Address Book control page per usergroup with tickboxes for all usergroups. I tick the usergroups I want this group to access, including. their own. Then they cannot PC other users outside these ticked usergroups. There is also a textbox for adding a username individually to a usergroup's Address Book. If possible I would also like to have the potential recipients in an Address Book available on the Create Conversation page, but obviously not if this is a large number. So for example if the restrictions of Address Book meant just the Admins (eg for newcomers) or just their own small team usergroup of 7 users plus admins, it would be great if these appeared the same style as Participants do in the sidebar. Anyone interested in doing this for me?