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Applies to: Lync 2013 | Lync Server 2013
A contact is a unified communication entity that is identified by a SIP URI. One or more contacts can be assembled into logical collections called groups. When a group is created, it's assigned a group ID, which is a server-assigned integer. The Contacts and Groups API in Microsoft Unified Communications Managed API 4.0 is available only for UserEndpoint objects.
For more information, see ContactGroupServices.