Using single a Exch 2007 Ent server on Server2008 R2. Have a single domain with 3 separate entities, each in a separate OU in AD. Would like to a way to create separate " Equipment" address lists, that are only available to the corresponding users in each separate OU. Is the best way to achieve this by creating a new address list in Exch Console->Organization Configuration->Mailbox? If so, I'm unsure as to how to set permissions so only users in an OU can only see their equipment address list. Appreciate any ideas/pointers.