Using Office Communications Server (OCS) 2007 R2 and Exchange Server 2007, Microsoft is providing the infrastructure for enterprise communications including e-mail, voice, video, IM, conferencing and unified messaging. Building on this infrastructure, the UC Platform APIs provide a platform you can leverage to build communications into your solutions providing incredible value for your users. In this session we provide you with everything you need to know to be successful with this new platform. We will give a quick overview of the required server infrastructure of OCS 2007 R2 and Exchange 2007 and how you can integrate those servers into your overall developer platform. We explain the underlying security, transport and messaging basics you need to know in order to implement common developer scenarios. We provide an overview of SIP for UC development and discuss how common principles like Presence publication/subscription are applied in your solution. Take an "under the hood" look at UC and get everything you need to start creating killer applications with communication!