How do you manage communication with people outside your company? Many of us are in roles that require us to communicate with people both internal and external to our organizations. Many of the external people I deal with would not be willing to use an additional tool just to communicate.
Good point. And we do still use email for external communication. But, even on those messages that then require internal communication and decision making or any next-actions, we shift the communication over to slack/trello/hackpad to get the work done and then reply back externally.