Microsoft Lync Server is software that provides a unified communications infrastructure for instant messaging (IM), voice and video calling and Web conferencing both within the organization and externally. Lync Server uses the address books maintained by Microsoft Exchange Server. Lync Server was previously Office Communication Server (OCS), which evolved from Live Communications Server.
Client Side
Microsoft Lync is the instant messaging client for Lync Server. It was formerly Microsoft Office Communicator, which replaced Windows Messenger.
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