We are implementing Exchange 2010 at one of our clients. We would like to enable the mail archiving feature in exchange 2010. We would like to archive user's old PST files, current mailboxes and incoming/outgoing email. We want the archive period to be forever - meaning we won't be purging anything from the archive. The client will be purchasing a 5tb SAN to host the archive databases. Can someone give us some direction on how to do this (documentation would be great). Also, how searchable would the archive be?