I did the upgrade to 1.1.1 just before 1.2.1 came out, yes it was fully backward compatible. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4009911#4009911 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4009911