A collaborative communication system is disclosed. The collaborative communication system integrates a number of electronic communication tools to meet the collaborative communication needs for an enterprise, family members or friends. All communications are within the system. According to one aspect of the collaborative communication system, registered users in the system are provided public, group and private arenas or domains. Depending on the privacy, communications with others may be conducted in any one of these domains. According to another aspect of the collaborative communication system, communications with others can be conducted through electronic internal mail (herein "i-mail"), instant messaging and file sharing. In particular, the i-mail operates on identifiers pertaining to registered users, thus eliminating the possibility of the registered users receiving unwanted email from other users outside the system.