E-Messenger is a web application that enables you to access MSN/AOL/Yahoo without 

 having to install any program or Java applet. All you need is a JavaScript enabled browser

 and you are set to go and use E-Messenger. Even if you're behind a firewall you still can

 use E-Messenger because all MSN connections and operations are managed on the server

 and the browser acts like the link between you and your MSN session.