that's the beauty of IM2000. The message is stored on the sending server and the headers are sent to you alerting you that you have a message. This allows for 2 things. First the server has to exist and be reachable, hence traceable. and second, the bandwith is being consumed by the sender and not the recievers. Making it more expensive to the sender and cheaper for the reciever. The problem is email is entrenched and a massive change of this nature is very difficult. In fact the only way I see it becomeing a reality is if the system develops in parallel. Then some mail clients can incorporate it, and people can start dropping the whole smtp/pop thing.