Hi All :
Lync Server 2013, Persistent Chat Server enables you to participate in multiparty, topic-based conversations that persist over time. Persistent Chat Server can help your organization do the following:
In Lync 2013, Persistent Chat functionality is integrated into the Lync 2013 client. As a result, users have access to Instant Messaging/Presence, Audio/Video, Conferencing, and Persistent Chat all in the Lync 2013 client.
This document will to show how to deploy Lync Server 2013 Persistent Chat server.
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