Quest’s Recovery Manager for Exchange can read the Exchange db right off the Networker backup tape without need of an Exchange server. It can save the mbx contents to a pst for importing into the ‘live’ mailbox. I’ll bet PowerControls can do the same.
Quest’s details are here: http://www.quest.com/recovery-manager-for-exchange/features-benefits.aspx I’m not sure about pricing/licensing though. /Rob