Topic Last Modified: 2011-05-16

To configure federation support for a Lync Online 2010 customer, you should have already completed initial deployment and configuration of Lync Server 2010 in your organization. This includes the following:

Additionally, the Lync Online 2010 customer must have the required Lync Online licenses and must enable federation for the Lync Online domain with which you want to federate. For details about setting up Lync Online 2010, including enabling federation for a Lync Online domain, see Set up Microsoft Lync Online at

The domain name of the Lync Online 2010 customer with which you want to federate cannot be the same as the domain name in your internal Microsoft Lync Server 2010 deployment.