Credit Suisse has been active in the field of service-oriented architecture over many years. I chose the birth date of the "Credit Suisse Information Bus" 15 years ago as the starting point of a long journey toward an enterprise SOA at Credit Suisse. I have selected a number of case studies that mark major steps in the SOA progress. Each case study starts with a strategic business need, continues with the chosen solution, and concludes with a discussion of the achievements and the remaining gaps. Putting these case studies into a historic perspective shows a continuous evolution, in which each step expands the business value, closes gaps of previous solutions, and, last but not least, leads to new challenges. I will illustrate each case study with examples and data.