Lotus Connections follows a consistent multitiered architecture across all of its services. This statement holds true both from a physical deployment topology and in regard to its service-oriented architecture. The former provides a loose coupling between physical layers, enabling the flexibility necessary in large-scale deployments to make independent decisions with regard to platform, hardware, and security zones. The latter enables a compelling presentation while still allowing the creation of ad hoc business mashups to meet the unique needs of each deployment. This chapter will take you through the Lotus Connections architecture and how it fits in a large deployment ecosystem.