MS outlook stores all its email data (emails, email attachments, sent items, inbox, drafts, notes and calendars) in the form of .PST. In case of PST corruption, all email items becomes inaccessible.
RecoveryFix for Outlook PST Repair repairs damaged PST file that usually bypasses the solution provided by inbuilt utility Scanpst.exe. However, user is expected to know about working of scanpst Outlook 2003.