So perhaps a badly written individual server doesn't scale (neither does an individual Apache instance). Google manages to scale XMPP to support each of their

So perhaps a badly written individual server doesn't scale (neither does an individual Apache instance). Google manages to scale XMPP to support each of their Gmail users. Is that big enough? Nokia runs all of the Ovi account on a Tigase-based backend. That's quite a few users. And all these disperate networks federate into a massive <cough>"web-scale"</cough> cloud of XMPP federation. So as someone building massively scaled components on XMPP, it scales!