Enterprise Vault message queues explained

**Enterprise Vault message queues**
R1	Items to retrieve from Vault
R2	Items ready for retrieval from Vault
A1	Pending Items that are already archived, but they are not yet replaced by shortcuts. Also failed operations
A2	Individual items to process. Used for manual archive requests and whenever Enterprise Vault cannot directly communicate with the StorageArchive queue of the Storage service.
A3	Mailboxes to process. Used for Run Now archiving.
A4	Individual items to process. Only used for retries when Enterprise Vault cannot directly communicate with the StorageArchive queue of the Storage service.
A5	Mailboxes to process. Used for background archiving. This queue is processed during the archiving window
A6	Requests to update folders with items that have been moved or copied to them.
A7	Synchronization requests.

See the Administrators guide for more information about the queues.