Cannot find Outlook .pst file in Outlook 2003/2007

Hi Experts,

I have got a problem regarding to my inability to find  .pst file in Outlook 2003/2007.

I downloaded repair tool to repair .pst file and tried to find it but no .pst file was available.

I used normal path to find the pst file (Documents and Settings/username/application data/microsoft/outlook), then went through Outlook2003- Tools-Options-Mail Setup tab- Data File, done search, selected ''Show hidden files and folders'' in Windows Explore and no .pst file is coming up.

Any clue where else to look for it so I can try to repair it.

Environment: Outlook 2003/2007  and Exchange 2007

Thank you in advanced!