Topic Last Modified: 2011-05-12

Microsoft Lync Server 2010 supports integration with Exchange Unified Messaging (UM) for combining voice messaging and email messaging into a single messaging infrastructure. Exchange UM is one of several server roles that you can install and configure on a computer that is running Microsoft Exchange Server. For Lync Server Enterprise Voice deployments, Exchange UM combines voice messaging and email messaging into a single store that is accessible from a telephone (that is, Outlook Voice Access) or a computer. Exchange UM and Lync Server work together to provide call answering, Outlook Voice Access, and auto attendant services to users of Enterprise Voice.

In addition to the support that previous Lync Server releases have provided for integration with on-premises deployments of Exchange UM, Lync Server 2010 introduces support for integration with hosted Exchange UM. This enables you to provide voice messaging to your users if you migrate some or all of them to a hosted Exchange service provider such as Microsoft Exchange Online.

Lync Server 2010 supports the following versions:

You cannot collocate Exchange UM with Lync Server or a Lync Server database. You can install Exchange UM and Lync Server in separate forests.

Exchange UM may not be required for Enterprise Voice deployments that have a PBX deployed, because the PBX can continue to provide voice mail and related services to all users. If you eventually retire the PBX, (for example, if you deploy SIP trunking for public switched telephone network (PSTN) connectivity) you must reconfigure Exchange UM to provide voice mail to users who previously used the PBX voice mail system.

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