The final Contoso architecture is shown in Figure 12-5.

Figure 12-5. Contoso's global Office Communications Server 2007 architecture

It is important to have an architecture diagram that shows the entire Office Communications Server 2007 deployment in an enterprise environment, as it can be used to explain the deployment to other departments that are involved with the deployment or to management. Also, for any technical discussions that require a high-level system overview, diagrams like the one in Figure 12-5 are useful.