Each queue has a suffix of Jpriority number, where J1 is the highest priority. The message queues are treated as FIFO (First In, First Out), and new messages are always added to the end of the queue.

An Exchange Journaling task processes the queues in order of priority. The task scans through each queue, starting with the highest priority. If it finds a message on a queue, it processes the message and then starts the scan again from the highest priority queue. Therefore, if there are messages on queue J1, queue J2 and J3 will not be processed until queue J1 is empty.

Monitoring queue J1 will indicate that a vault store backup is correctly deleting the messages. However, if J1 is being used during normal use (before a backup), this may indicate a problem with tasks. Check the Enterprise Vault event log for errors.

Monitoring queue J3 will indicate that at least every minute a process mailbox message is on the queue (a new message will only be added if the queue is empty). There should never be more than one message on this queue. The message should appear on the queue and then disappear as soon as queue J1 is clear. Any new messages in the journal mailbox will be processed.

If a queue has not been processed for more than 10 minutes, and there are no messages in a higher priority queue, there may be a problem with the tasks. Check the Enterprise Vault event log on the Exchange Journaling task computer for any additional information.