There are no adjustments to the Lync topology that are required to enable the unified contact store. After the prerequisites for Lync and Exchange integration have been met, the unified contact store is automatically enabled. There are three conditions that must be met for a user’s contacts to be migrated to unified contact store:
• The user is assigned a user services policy where the
UcsAllowed property is set to
True (the default).
• The user is provisioned with an Exchange 2013 mailbox, and has logged in to that mailbox at least once.
• The user logs in to Lync using the Lync 2013 client.
If these three conditions are met, the user’s contacts are automatically migrated from the Lync Server database ...