The Re-enumerate command refreshes the messages that you are currently viewing in the details pane and provides you with the most current data.
If you use Custom Filter to enumerate the 10 largest messages in a queue, for example, it is possible that after a certain amount of time, larger messages will enter the queue. You can periodically use the Re-enumerate command to refresh your message pool. Re-enumerating refreshes your message pool with the last criteria used.
To re-enumerate the messages in a queue that you have already enumerated:
For SMTP queues
For X.400 queues
For MAPI (connector) queues
Note If you have not enumerated the messages in a queue before, the Re-enumerate command is not available.