Here are some quick descriptions to some other helpful docs in the OCS Library that will help with your Office Communications Server 2007 deployments.
Technical Reference: This document provides in-depth technical information on the components, protocol and architecture of Office Communications Server.
Security Guide: The security guide provide guidelines for assessing and managing security risks to your Office Communications Server 2007 deployment.
Supportability Guide: The purpose of the Microsoft Office Communications Server 2007 Supportability Guide is to provide a central, high-level reference for supported Office Communications Server 2007 topologies and configurations. It is also intended to answer frequently asked questions. This document identifies supported topologies, configurations, and scenarios described in detail in the existing deployment and planning documentation.
Source:→ OCS Blog