"PeterJ" wrote : Try the steps to replace the serverdef file again, they worked for me. Thanks PeterJ .. I must be grabbing the wrong fixed serverdef, or not have the environment I thought I did, because I still get: Missing classpath entry C:\Apps\JBoss\jboss-5.0.0.GA\server\default\lib\mail.jar when I try to add a jboss server. These are the eclipse steps: click on menu window : show view : servers a server tab is visible next to tasks, problems etc at the bottom. I right click and select 'new : server' a dialog comes up I click on jboss and it expands showing 3 versions of JBoss. I double click on JBoss v5.0 the next button becomes available and I click on it the dialog now says 'New JBoss runtime' at the top is also says Missing classpath entry there are 2 edit fields. one field says default jre one field says /your_server_root/appservers/jboss I replace the text in the second edit field with this: C:\Apps\JBoss\jboss-5.0.0.GA the text at the top says now: Missing classpath entry C:\Apps\JBoss\jboss-5.0.0.GA\server\default\lib\mail.jar I do see this line in the serverdef file: and I verified on the file system that mail.jar is in C:\Apps\JBoss\jboss-5.0.0.GA\common\lib so I'm just a bit perplexed. I did start with "eclipse -clean" thanks for any observations... I do know sometimes I'm incredibly careless and it can be sooo costly. View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4209328#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...