Decent public Jabber service

**OMFG - at last there’s a decent public Jabber service - with chat sync “as in skype”!** Technically, it means Message Archive Management (XEP-0313), Message Carbons (XEP-0280) and message delivery to offline enabled for users! Almost all public Jabber servers I know disable it, so that your conversation history always gets broken, having messages lost and split across your multiple client instances. **OMFG - videocalls are also possible!** (working hard to make your adoption easier)