Download Microsoft Lync Server 2013 Persistent Chat Server SDK from Official Microsoft Download Center

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Microsoft Lync Server 2013 Persistent Chat Server SDK

Lync Server 2013 Persistent Chat SDK includes the pre-requisites needed to build applications that target Persistent Chat Server, the API and documentation to build the applications, and PersistentChatSDKRuntimeSetup.exe which is the redistributable you ship with your applications.