The topics in this section explain how to configure Office Communications Server in a resource forest topology. As explained earlier, in a resource topology, a single resource forest contains all Office Communications Server servers and disabled user accounts for each logon enabled account in a user forest.

As explained earlier, a resource forest topology is an Active Directory Domain Services topology used to deploy Office Communications Server and Microsoft Exchange Server in one Active Directory forest while all logon enabled user accounts are located in a separate Active Directory forest. The resource forest hosts only servers and does not contain any primary user accounts. The primary user accounts from other forests are represented as disabled user accounts. The SID (security identifier) of a disabled user account in the resource forest is mapped to the corresponding primary user account in the other forest to allow for single sign in. These disabled user accounts are enabled for Office Communications Server and mail-enabled for Exchange Server if it is deployed.

In This Section