Hi Scotty,
I didn’t want bother you for an office visit, but we’d like to back up our emails on a jump drive. I wanted to click on “Export Mailbox” but I got nervous that this would move it or delete it somehow. Can you quickly advise us how to back up our emails using the exchange email?
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Using the export mailbox should be totally fine. It will place a copy of the selected box or boxes on the desktop or where ever you choose for them to go. They will be in the form of "mbox". This does not allow for individual emails to be browsed within the Finder. Instead, if you ever need those emails again, you would choose to import the mailboxes back into Mail and then you'd be able to see the individual emails once again.