AS2Box.net - Yes, it can simpler!

1. Click on the link http://demo.as2box.info/outgoing/, and connect with user: demo and password: demo.

   Unfortunately, this WebDAV integration seems to work only with Microsoft Internet Explorer. If your browser does not support the WebDAV integration, you will be redirected to the Microsoft web site ;-)

2. Drag-and-drop the file you want to send to the mendelson AS2 test server into the folder.
    
3. Then, you can go to http://as2.mendelson-e-c.com:8080/webas2, and connect with user: guest and password: guest, in order to check if your file has arrived.

Of course, I am not very happy about the fact that it only works with Internet Explorer, so I will have to look for an script-based file manager for web user interface, any suggestions are welcome ;-)