My boss has set his new mail to go to a pst folder so new invitations arrive
in the pst calendar.  He keeps up the calendar in his 'mailbox' (the one that
used to get new mail, or rather where new mail is forwarded from) because
that's the one others can share.

If he copies the items from the Mailbox/exchange calendar to the pst
calendar and then updates the pst calendar, is there any way to make the
exchange calendar automatically mirror what he does to the pst calendar?

Thanks in advance.