COI – Chat Over IMAP
> With XMPP and Matrix.org -based services you would still need to convince everyone to join your new network. Easy in theory, very complex in practice!<p>I think they missed the the bit where Matrix is called Matrix because it bridges (matrixes) the existing networks (Slack, IRC, Telegram, Discord, XMPP, etc) in, rather than needing to convince everyone to join.  But no matter, we'll just provide a COI bridge if this takes off :)