The Microsoft Unified Communications AJAX API 1.0 shipped with Microsoft Office Communications Server 2007, and works with the Communicator Web Access role of that version. Microsoft Lync 2010 does not
support the Communicator Web Access role, and therefore developers are recommended to use the Microsoft Unified Communications Managed API 3.0 to build web services that work with Microsoft Lync 2010.
Download the Microsoft Unified Communications Managed API 3.0 SDK
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