Threema is the best-selling secure messenger. More than 11 million users in Europe and beyond already use the Swiss company’s services, which are focused on consistent metadata restraint and privacy protection. Among them are two million users in over 7,500 companies, organizations, government agencies, and schools who use the business solution Threema Work. Well-known corporations such as Mercedes-Benz Group, Allianz, Edeka, and TK Elevator use Threema Work as their internal messenger. Many small and medium-sized companies as well as public institutions (e.g., ADAC, Switzerland’s federal administration, and the city of Frankfurt am Main) also use the service.