Prerequisites When Deploying Office Communications Server in a Central Forest Topology

Microsoft Office Communications Server 2007 and Microsoft Office Communications Server 2007 R2 will reach end of support on January 9, 2018. To stay supported, you will need to upgrade. For more information, see Resources to help you upgrade your Office 2007 servers and clients.

To support a central forest topology, the following prerequisites are required:

• Microsoft Identity Integration Server — To synchronize data across your forests, you must deploy Microsoft Identity Integration Server (MIIS). The following QFE is required for proper cross-forest synchronization: https://www.microsoft.com/downloads/details.aspx?familyid=FA9DBB67-4654-4C94-B073-AA59676130AF&displaylang=en. For information about how to deploy Identity Integration Server, see the Identity Integration Server documentation.

• Office Communications Server deployed in your central forest — If you have not deployed Office Communications Server, see the Microsoft Office Communications Server Planning Guide and the Microsoft Office Communications Server Deployment Series.

The central forest can be an existing forest that hosts existing Office Communications Server servers, users, groups, contacts, or you can create an entirely new forest.

The central forest should normally be the one that hosts the largest number of users. Connectivity between the central forest and other forests should also be highly available. Figure 1 shows how an example organization, Contoso, configured an Enterprise pool in its central forest.

Figure 1 Example of a Multiple Forest topology

After you have deployed Communications Server in the central forest, complete the following steps:

1. Configure Microsoft Identity Integration Server.

2. Enable contacts for Office Communications Server.