Table: Exchange Mailbox task queues describes the queues that the Exchange Mailbox task uses. Here, server is the name of the server being managed by the Exchange Mailbox task, and queue is a number that uniquely identifies the queue.
Table: Exchange Mailbox task queues
Table: Messages in the Exchange Mailbox task queues provides more information on the messages that the Exchange Mailbox task may place in queues A1 through A7.
Table: Messages in the Exchange Mailbox task queues