David wrote:

So, it sounds like I can have all e-mail delivered to "Mailbox -
Username", delete the "Personal Folders", remove the pst file, and
end up with both Exchange e-mail and POP3 e-mail stored on the
Exchange server (allowing for the fact that I have to manage user
volume). Am I understanding things right? Thanks.

Your understanding is complete. Close the Personal Folders with
right-clickClose, stop Outlook, then delete the PST, if you want to delete
it.
--
Brian Tillman