Is it possible to do a mailbox level backup of a specific mailbox store? For
example, in FIRST STORAGE GROUP, I have multiple MAILBOX STORES. I want
to backup all the mailboxes in "mailbox store ABC" without having to list
each mailbox in the policy.

I have tried using variations of Microsoft Exchange Mailboxes:\FIRST STORAGE

But so far nothing has worked. I'm starting to think that the answer is
no, but I wanted to get other feedback before giving up.

Thanks for any help!!