the installer can install support for things like EJB3 so most likely contains newer (and possibly more) jars than the zip. You can just zip the installation directory created by the installer and have your own zipped version. JBoss 4.0 works very well with 1.5, in fact it requires it for some functionality (like EJB3 support). View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4024262#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...