As far as I can see, there isn't any support for other messengers anymore. I can understand this for older protocols, but even "Oscar" for AIM was still usable with ICQ. Since most ICQ users with Messenger would be using xmpp transports it's really a mess that eben xmpp/jabber has been dropped. Messengers has been my central point for communications like iMessage, XMPP and with transports icq, irc. Now, I need to use two messengers like Adium again.