The first one is a zip file that contains three pre-packaged server configurations. Download, unzip into a directory, then go to the bin directory and type "run", that's it. The second one is an installer with a wizard that asks what configuration/services you want and installs only those. Download it and run it and the wizard will ask you the installation questions. Based on the number of questions and issues posted on the forum related to the second one, the first one seems to be the most trouble-free. However, if you want to try out EJB3, then the second one is the way to go -- the first one does not come with EJB3 support. (Or you could do what I did - download the source an compile with a 5.0 JDK -- the result is two different variants of jboss, one being the first install option, the other being something similar but for EJB3.) View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3967497#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...