The virtual shelf – a digital sales shelf – forms the core of customer interaction. The focus here is on assisted sales processes that make product knowledge about the comprehensive range in the post office available step by step even to employees who have not been trained in the subject. This offers great potential for efficiency and quality assurance, especially for complex product groups such as mobile telephony, insurance or energy contracts. With the digitally supported sale of the A1 product range, the system was fully challenged right from the start.