after a recent crash on windows live mail, i lost all of my older emails.  i lost everything except the last 2 days.  all prior emails are gone.  how do i retrieve?

When I attempt to archive my email and contacts, the program consistently crashes and I have to restart it. The backup archive file is not completed and not usable./  This has happened multiple times. I did rebuild my database but this did not help. Any suggestions on how to fix this?