ADVENIAN has successfully concluded the transformation of the customer-service and back-office functions of a leading B2B- services company in the Swiss market. Customer Churn and weak new business required action to dramatically increase customer service performance, as a condition for the new start of that customer’s Swiss business. At the initiative of the European Corporate leadership, ADVENIAN operationally led the transformation of the Swiss business. Following an effective analysis and the priorization of performance-barriers most relevant back-office processes were simplified and accelerated. This was supported by a quick-action program to improve IT-functionality in Customer Service and Back-Office. A more effective organization structure was implemented with an almost completely newly hired back-office team. A newly developed, pragmatic KPI- Management system was developed to develop transformation leadership. On the Sales level, complexity reduction in service portfolio and pricing actions were implemented in order to support improvement of customer service levels. As a result top KPI have been moved to a best-in-class level in the market. Customer churn started to come down significantly, and attractive Service Level Agreements could be signed with top customers. A team of ADVENIAN led this Transformation through a Chief Restructuring Office over a period of 6 months.