"gaohoward" wrote : I agree with your reason. There is one exception, if user wants the ordering of messages to be determined by the time they arrive at the target queue (the time is the machine time that hosting the queue), the ordering has to be calculated on the server. | I don't understand that, ordering is always calculated on the server. Perhaps you could explain the point in more detail.... View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4206192#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...