Unified Contact Store

The second feature enabled via server-to-server authentication is the Unified Contact Store (UCS), an option that nearly made it into Lync Server 2010, but was scrapped at the very end. Without UCS users maintain separate contact lists within Exchange and Lync, where information might not be in sync, and the data is stored independently. When the UCS feature is enabled for a user, the contact list is consolidated to Exchange and can no longer be directly edited with Lync, but users can now edit their contact lists without being signed in to a Lync endpoint.

The Lync servers maintain a cached, read-only copy of the contact list that users can still view when Exchange is offline, but any modifications are made to the copy ...

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