Why EV is not archiving my Outlook email yet ?

Can anyone here please assist me in troubleshooting my EV 9 archiving my Exchange Server 2007 SP3 mailbox ?

I can see that after I add new 1 TB LUN the drive is getting filled with some data but somehow the outlook email since last year is not archived yet by EV.

how can I make sure that EV can archive my Outlook mailbox and also other mailbox in the Exchange server.

Thanks in advance.