A fair amount of my clients use Microsoft Outlook, and sometime when using it you might run into issues. There is a utility that Microsoft provides called SCANOST.EXE or SCANPST.EXE
SCANOST would be used to repair a local exchange copy of what is on the exchange server. The SCANPST is used with Outlook data file for use with a POP email service.
These programs might be able to clear up a corrupted outlook file.