Question

Which version of node.js is actually running on Windows Azure Web Sites?

Answer 1

It turns out to be, at the moment of writing: v0.6.20.

Quickly found out via the following script:

var http = require('http');
http.createServer(function(req, res){
    res.writeHead(200, {'content-type': 'text/plain'})
    res.end('Version - ' + process.version);
}).listen(process.env.port || 1337)

To follow and try it yourself follow these steps.