In the thesis we researched the field of communication in organizations. In the first part we described a case of communication and some problems that usually occur in the organizations, not using programs meant for communication. Later on we tested and described some of the already known solutions in the field of collaboration and communication. Then we presented the idea of the application that we realized in the following part of the thesis. The main part of the thesis is therefore meant for the construction and the implementation of the application. We described the course of preparation of the database and the realization of the lead communication. Further on we presented the implementation of the lead communication and the implementat...