In this chapter, I am going to tell you a story. This is the story about a fictitious customer (ACME corporation) that decides to start with BizTalk Server as its integration system. Because at the beginning they start only with one non-mission critical application, the sizing of the initial environment is small. Gradually, they add more and more applications, so they have to figure out a way to improve the platform. Even though this is an imaginary exercise, the situations described here are quite common with each evolving BizTalk server customer.