Lync Server Certificate Requirements

Following are the primary uses for certificates within Lync:

• Communication between Lync clients and Lync servers is encrypted using TLS.

• Authentication between Lync 2013 servers, as well as authentication among Lync 2013 servers, Exchange 2013 servers, and SharePoint 2013 servers, uses server-to-server OAuth certificates.

• Communications between Lync servers is encrypted using MTLS.

• Automatic DNS discovery of partners for federation uses certificates for authentication.

• Remote or external user access for any Lync functionality is encrypted, including IM, audio/video (A/V) sessions, application sharing, and conferencing.

• A mobile request using automatic discovery of Web Services is encrypted.

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