Microsoft Office Communications Server 2007 R2 supports topologies that are designed to meet the needs of organizations that are small, medium, or large and that have varying requirements for performance, high availability, and scalability. It also integrates with various server and client technologies. The following sections identify the topologies, configurations, and system requirements for Office Communications Server 2007 R2, including the following:

The following figure illustrates external, perimeter, and internal network segments with the logical components that are described in sections that follow.

Figure 1. Network segments and logical roles

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