Answer: In Exchange Server 2010 the Address List is a collection of Recipients and other objects like Users, Contacts, groups and resources.
With Exchange Server 2010 we can create a custom address list and this article will show how to create one.
To create a new Address list In Exchange Server 2010 follow the steps below:
Open EMC -> Organization Configuration -> Mailbox -> Address List tab
Right click on a blank area and select New Address List from menu.
Type the Name, Display Name and AD container.
Select the recipient that will be in the new Address List.
Select conditions if needed.
Select when to create and Finish.