I am running Exchange 2010 SP1 and need to do an eDiscovery on a single department within the organization. I have done that on all mailboxes as requested, but they want to go back several years to make sure that we can search mailboxes of people that have departed and whose accounts/mailboxes have been deleted. I have backups on tapes, but they would be Exchange 2007 .edb files and i don't think that i can restore those to Exchange 2010 RDB. I don't want to install Exchange 2007 unless that is the only recourse. I need some ideas on restoring those database files or accessing them and then do a search for the particular mailboxes. If there is a service that can do this for us, that would be great. Or maybe an applicaton that might be able to extract the data from the backup tape and provide the search capabilities. Any suggestions would be appreciated.