This document discusses Microsoft Unified Communications including Exchange and OCS. It provides an overview of the OCS 2007 R2 architecture and Exchange 2007 server roles. It then demonstrates various OCS 2007 R2 and Exchange 2007 features such as delegation, communicator attendant, communicator mobile, single number reach, communicator web access, cross platform desktop sharing, group chat, response group, and dial-in conferencing. The goals are to streamline communications and provide operational flexibility and control.