Configure Identity Integration Server in the following manner:

• If Microsoft Exchange Server 2003 is not deployed in a cross-forest topology, deploy and configure the Office Communications Server Sync tool (Lcssync). Lcssync is included with the Microsoft Office Communications Server 2007 R2 Resource Kit. The remainder of this section focuses on using Communications Server Sync.
  
  
• If Microsoft Exchange Server 2003 is deployed in a cross-forest topology, use the GAL (global address list) sync tool with the Office Communications Server Sync logic. Exchange Server uses GAL sync to synchronize contact information in the GAL between forests. In this situation, an update to the GAL sync tool is required because MIIS does not support the coexistence of two different synchronization agents.
  
  
• If Microsoft Exchange Server 2007 is deployed in a cross-forest topology, until a solution from MIIS is available, you must manually synchronize the required attributes or use a custom application. For more information about the attributes that must be synchronized in this scenario, see Appendix A: Attribute Synchronization in Cross Forests for Office Communications Server 2007 R2.
  
  

The Office Communications Server Sync tool configures the management agent of each forest except the central one in order to synchronize its user and group information with MIIS. MIIS generates a metaverse object that represents each user or group and it then synchronizes each user or group object as a contact in the central forest. Since all Communications Server users and groups are synchronized as contacts (including the users or groups object SID) in every other forest, users can still communicate with each other across forest boundaries after MIIS is reconfigured and users can still take advantage of distribution group expansion across forests. Figure 2 illustrates how MIIS was reconfigured in the Contoso environment.

Figure 2. Configuring the MIIS Server

As Figure 2 illustrates, the MIIS server is configured to do the following:

• Import the user objects and group objects from two user forests as MIIS metaverse objects.
  
  
• Export the metaverse objects to the central forest as contact objects.
  
  

To install and configure the Office Communications Server Sync tool, Lcssync, perform the following steps (each step is explained in detail in the subsequent sections):

1. Install the .NET 2.0 Framework on the MIIS Server.
   
   
2. Install the Office Communications Server Sync Tool.
   
   
3. Extend the Metaverse Schema in MIIS.
   
   
4. Configure Extensions for the Office Communications Server Sync Tool.
   
   
5. Configure the Object Deletion Rule in MIIS.
   
   
6. Create a Management Agent for the Office Communications Server Sync Tool in the Central Forest.
   
   
7. Create a Management Agent for the Office Communications Server Sync Tool in all User Forests.
   
   
8. Import, Synchronize, and Provision Office Communications Server Objects.