The transition from email to messaging is in full swing. While the transition in the consumer market has already been completed, more and more enterprises are looking for secure messengers and chat apps to increase productivity, solve the WhatsApp problem, and improve communication with employees and customers in the messaging age. Correspondingly, the demand of companies, corporations and authorities for secure chat apps, communication tools, group chat software and messengers for enterprises grows strongly. The market for secure chat apps and messengers for businesses is not easy to grasp and there are significant differences between vendors and the different product categories. In the following we describe the most important product categories of messaging tools, list the main advantages and disadvantages and name some leading providers: