businesses can use various methods to back up their email.
probably utilizing an Exchange or IMAP account if you use email for business.
Your email is automatically archived by Exchange and IMAP servers so that you
can view it from anywhere at any time. If you have an Exchange account, ask
your administrator how to access your old emails.
want to back up the message folders locally (in addition to maintaining them on
the server), you can use AutoArchive to relocate or remove older things
automatically, or you can export the items to an a.pst file that you can
restore and use later.