This chapter provided a description of the new features of and significant enhancements to the existing functionality introduced in Office Communications Server 2007 R2 as well as a technical overview. Now that you have read this chapter, you should have a better understanding of the new features that are offered as well as an overview of how they work and how they fit into the Office Communications Server 2007 R2 topologies. There are additional resources you can leverage to gain a deeper understanding of each of these areas, and this information is provided throughout the remainder of this book.