Yes, DigiScope can access Standard and Archive Mailboxes within any Exchange database. The only requirement is that DigiScope must have a license installed for the database/store where the standard/archive mailbox resides

NOTE:  Starting in Exchange 2010 SP1 Archive Mailboxes can be located within any Exchange database, i.e. within the same DB as the Standard Mailbox and an alternate database. Therefore ensure that you have identified the actual database that holds the archive mailbox before purchasing/applying licensing