I do not give a monkey's whether it is FOSS, MOSS or BOSS. Can they talk to each other? Can I use Dross or whatever the newest hit of the month is called and chat with my sister in Italy who uses Skype, my boss in the UK who uses Whatsapp and my colleague in the US who uses Slack? No? Then I am not interested. I already have three things to worry about. I do not need four.