Today enterprises work in a rapidly changing environment. Those changes bring uncertainty about future that can result in high risks but also in new business opportunities. Modern communication technologies enable a better management of information and knowledge flows, what is essential to achieve a success in business. Digitalization processes experienced by modern companies require improvement of communication processes and knowledge management. This paper elaborates the essence of communication in modern companies. It overviews available IT tools supporting communication and knowledge management in enterprise. The aim of this article is to assess the current level of use of IT tools supporting knowledge management, by the companies considered as leaders in Poland, so the last part of the paper presents results of a survey research concerning usage, expectations and evaluation of available tools in Polish companies.