Tried on two different machines with same results. Win-xp-pro Outlook2003. I choose all the different options to backup Outlook files under the mail files menu . I start the backup and after running for a few second I receive an error message stating "Acronis has encountered a problem and must shut down, would you like to send an error report to Microsoft" Some additional info. I can backup my Outlook pst file fine if I use the data backup instead of the mail files backup.