I have already tried the Inbox Repairing tool otherwise also known as "Scanpst.exe" to fix my PST file.

The message I get in the log file is

Code:
Microsoft (R) Inbox Repair Tool
Copyright (C) Microsoft Corp 1995-1996. All rights reserved.

**Beginning NDB recovery

  **Attempting to open database

  **Attempting to validate header

    !!Header NDB version mismatch (read=0017, expected=000F)
The file is created using Outlook 2010. Any ideas to get this repaired would be great. This file contains 5 years of timesheets sent to my employer.

What else can I do to recover these mails?