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.
The following modes are supported:
- On-premises Mode Lync Server and
Exchange UM are both deployed on local servers within your
- Cross-premises Mode Lync Server is
deployed on local servers within your enterprise and Exchange UM is
hosted in an online service provider’s facility, such as a
Microsoft Exchange Online data center.
- Mixed Mode Your Lync Server deployment
has some user mailboxes homed on local servers running Microsoft
Exchange Server within your enterprise and some mailboxes homed in
a hosted Exchange service data center.
Note: Mixed mode can be used as a transitional solution during evaluation and stepwise migration of users to hosted Exchange UM, or a permanent solution if you opt to keep some users’ Exchange UM services on-premises after migrating others.
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.