DPM 2010 granular restore of Exchange 2010 mailbox data

Good morning!

This is a non-urgent problem ... which may not even be a problem... but something I'd like some experienced help in figuring-out.

I recently deployed my first-ever Exchange 2010 server - things are going very well.  I love it.  I also deployed my first-ever DPM 2010 server... I'm also loving this product.

Between Microsoft KB's, other support available elsewhere, and my own intuition (or lack thereof) I can't seem to figure out how to do a granular restore of mailbox data where I have a protection group created for the mailbox store.

I can do a restore all the way down to the individual mailbox level... but not WITHIN someone's mailbox.... like a particular message, folder, or other exchange data item.

Somewhere along the line I got the idea that this was a feature included in DPM 2010... it's not going to hurt me terribly if it isn't the case... but I want to make sure I'm not missing something.  Do I need ESM installed on the DPM server maybe to see inside the mailboxes.... kind-of like you have to have Hyper-V installed to see inside a VHD?  Or am I missing something else?  Or am I expecting a feature that never was?