Last time I checked, you had to have a very specific server/client combo for very basic features like mobile app, offline messages, and multi-device message his

Last time I checked, you had to have a very specific server/client combo for very basic features like mobile app, offline messages, and multi-device message history. Grabbing a random server or client may result in some (or all) features missing. That’s why we recommended Slack for the next workplace. No chance to get anything wrong, and no need for backups either.