Topic Last Modified: 2011-01-26

The Lync Server 2010 ExUM Routing application supports integration with Exchange Unified Messaging (UM) in an on-premises environment, where Lync Server 2010 and Exchange UM are both installed locally within your enterprise, or in with Exchange UM hosted by a service provider, as shown in the following diagram.

On-premises Lync Server Exchange UM Deployment

The following modes are supported:

To integrate Lync Server with hosted Exchange UM, you must configure a shared SIP address space (also called a split domain). In this configuration, both Lync Server and the third-party hosted Exchange UM service provider can access the same SIP domain address space. For details, see Hosted Exchange UM Integration Architecture in the Planning documentation.