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Microsoft® Lync Server 2010 Unleashed by Tom Pacyk, Andrew Abbate, Alex Lewis

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Planning for Certificates

One of the more difficult decisions when using Public Key Infrastructure (PKI)-enabled applications, such as Lync Server 2010, is the decision to use internal or public certificates. In this context, internal is defined as coming from a Certificate Authority that is not automatically trusted by the operating system, whereas public means one coming from a Certificate Authority that is already present in the trusted root store of operating systems.

Lync Server 2010 uses certificates for the following purposes:

• External or remote user access to audio/video sessions as well as conferencing and application sharing

• Remote user access for instant messaging

• Federation using automatic DNS discovery of partners

• Mutual ...

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