I'm sure you can... but I think one of the big hiccups is that you need DNS to point to your server if you want it to be externally available. I've used XMPP s

I'm sure you can... but I think one of the big hiccups is that you need DNS to point to your server if you want it to be externally available. I've used XMPP servers for intra-organization chatservers before though, and it worked great!