Problem in Outlook after MS Office upgrade to 2003

I just upgraded Microsoft Office to 2003 from 2000 and I have a problem with Outlook. When receiving emails, Outlook crashed and after restarting it, it says the ‘pst’ file is damaged. I even tried to restart in safe mode the problem persists. The PST file size 0.38 GB but the limit is up to 2 GB. Can anybody please help me?
