After you have synchronized the new data that was imported from all user forests, you provision the central forest so that contact objects are created, updated, or deleted for each change in the user forest and any new contacts are enabled for Office Communications Server.
To provision the central forest
On the Microsoft Identity Integration Server (MIIS) computer, start Identity Manager: Click Start, point to All Programs, point to Microsoft Identity Integration Server, and then click Identity Manager.
Click Management Agents.
Right-click the management agent for the central forest, and then click Run.
Click Export, and then click OK.