You can use the Office Communicator Search box to find the people you want to add to your Office Communicator Contact List, and then drag the names from the Search Results pane into the Contact List.
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Find and add a contact to your Contact List
In the Office Communicator main window, in the Search box, type the display name or e-mail address for a person. By default, Communicator lists all matching users from the Active Directory Domain Service and the Microsoft Outlook messaging and collaboration client Contact List.
Drag the name from the Search Results pane into the Contact List. You cannot drag a contact into a distribution group in your Contact List.
What happens when you add a contact to your Contact List?
When you add a contact to your Contact List, the contact is sent an alert indicating that he or she is added to your Contact List. When you add a contact in your company to your contact list, the contact is granted the Company access level by default. Contacts outside your company are granted the Public access level by default. Access levels let you control the amount and type of Presence information that is available to others. For more information about access levels, see Presence FAQ - Communicator.