so? you could try. even your portable WLM don't need administrator privilege to run,
network admin could still block you by port blocking, packet filtering
msn ip and port is 65.54.189.86:1863, i could block this.
even new msn could change the port, using 443/80 to login, there still other methods to block,
so, don't think you could escape
it depends company policy to block or not, not your will to use or not
if i install NetOP, or Anyview, you never escape, even your privacy!