We first evaluated Mule and really liked it...this was on version 2.6.1. However, management decided they wanted a complete JBoss stack, so we used the JBoss ESB. After porting everything over that we did on Mule to JBoss ESB (no small task), we had a few observations: * Mule had more mature API's and much more documentation/examples. * Mule was less intrusive and easier to use. * Running the JBoss ESB and Portal server on the same JBoss A/S is possible, but very tricky. For example, we have not been able to update to the latest version of Portal because ESB requires a different version of the A/S View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4124486#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...