The PST file in my Outlook account was corrupt and when I scanned it by using scanpst.exe tool, it gave the following error -
An unexpected error prevented access to this file. Use ScanDisk to check the disk for errors, and then try using the Inbox Repair tool again.
The above mentioned error clearly indicates that the PST file is severely corrupt and cannot be repaired using the scanpst.exe tool. To overcome, this problem use any professional third-party recovery application which can rectify the corruption and recover the lost information.