EV Message Queues Not being Processed

Hi I have this problem which is driving me nuts. I have in a test environment targetted an exchange 2010 server and wish to archive mail in a dummy mailbox. However whatever I try I cannot get the mail out of the Pending Archive State.

I'm guessing it has something to do with  EV not being able to communicate via MAPI with the mailbox.

I've run the assign permissions script to the vault service account(VSA) and created a system mailbox and the outlook profile for this.

What am I missing?

I've tried running the archive task in reporting mode but it doesn't tell me anything, I've used DTRACE before but am not sure what I would need to DTRACE in this instance.

Would appreciate any help whatsoever.