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If it does not, or if the registry value does not exist, then you should download and install the UCMA Runtime setup program from the Microsoft Download Center at. The ImplementationDLLPath should point to the folder location for the file .dll.
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HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MSExchange OWA\InstantMessaging\ImplementationDLLPath You can do this by looking for the existence of the following registry value: In order to integrate Lync Server 2013 and Outlook Web App, you must first verify that the Unified Communications Managed API 4.0 Runtime has been installed in your Microsoft Exchange Server 2013 backend server. In addition to integrating with Microsoft Outlook 2013, Microsoft Lync Server 2013 can be fully integrated with Microsoft Outlook Web App 2013 among other things, this adds instant messaging and presence to Outlook Web App, and enables your unified contact list to be shared between Outlook Web App and Microsoft Lync 2013.
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