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For Office Communications Server 2007, the ForestPrepaction of the Lcscmd.exe command-line tool sets up the Access Control Entries (ACEs) that allow the Office Communications Server service to access the new global settings tree. You must run the forest preparation step again to create the ACEs for administrators and for Office Communications Server services and to validate the new global settings tree. You cannot use the Prep Forestwizard for this migration step. For details about forest preparation for Office Communications Server 2007, see Office Communications Server 2007 Active Directory Guide at http://go.microsoft.com/fwlink/?LinkId=129697 .

This step is complete when all permissions have been created for the new global settings tree, and the new global settings tree is replicated to forest global catalogs. Depending on the topology and replication configuration, full replication can take anywhere from minutes to days.