Sazneo is a relatively new group chat app, which allows companies to break down the conversation on different channels, which may include team members, as well as persons outside the organization. Within each of the channels of IRC there is repository uploads, so team members can easily exchange documents, graphics and other files.
It offers very granular control of who see and participate in the flow of chat. The application also supports private email, instant messages. Conversation, which are no longer active, you can close and export to HTML for secure archiving.