Repair Outlook 2007 Ost

What methods exist to repair corrupt Outlook 2003 .PST & .OST files besides using the scanpst and scanost utilities?An Outlook 2003 user frequently gets messages when he launches Outlook 2003 that the data file is corrupt.I have used both the scanpst.exe and the scanost.exe utilities to scan and fix the user's two Outlook data files.However, after several days the user continues to start getting these error messages again and using the scanpst and scanost utilities don't fix the problem.I've heard that there are other methods available such as the Inbox repair tool. However, I don't know how to access or use these other repair methods.So what other methods exist that I can use to repair the user's corrupted Outlook .OST file and Outlook .PST file?