AS4 is a quite recent standard for that message-based transfer of business documents. AS4 is based on both, Web Service technology and ebMS 3.0 – the successor of the “ebXML Messaging Service 2.0” which has been implemented by Ponton already in 2003. Ponton’s over 200 users world-wide use Ponton X/P to transfer up to 100.000s electronic documents daily at a high rate with a message size of up to 500 MB, running in a high-availability environment.