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Problem:  When trying to backup my exchange 2010 server using Roxio Retrospect 7.7 I got the following error:   “Sorry, can’t list volumes on Exchange mailboxes on exchangeserver. Error 3420 Uknown”.   When I would look at the volumes in the client portion of Retrospect, I got an “Can’t track volumes, error –3420(Unknown).   All of this had Continue reading →