Rick;

I work for a company called Ubitech, we recently deployed an email
archiving solution from a company called NorthSeas you offer an email
archiving appliance.  I'm not sure about your first requirement but
it sounds pretty similar to the issue we needed addressed.  We were
running into email storage issues and our users were complaining about
lost email and wasting time backing up their email.  The appliance sits
in front of the mail server and captures every message that is sent or
received in real time, before it has reached your mail server.  This
way, there is no risk of a message being lost before it is archived and
users don't have to do anything for their mail to be archived.
As for the second requirement- the appliance has a web interface for
searching for email and redelivering it back into a users inbox.  Most
of our users have their outlook client setup so that the search
application is imbedded within outlook so they can search for old
email, view it on the archive and then if they want to do anything with
it, they click on a button and then it will be redelivered to them.
There's no risk of losing email, users don't have to worry about
managing their email because they can always get it again from the
archive.  If you want more info, I believe their website is
www.northseasamt.com