Errors in Outlook.pst

I’m using Office 2000 SR-1 with Windows98 SE. When ever I go to delete an email Outlook gives me an error that says

“Errors have been detected in the file outlook.pst. Quit all mail-enabled applications, and then use the Inbox Repair Repair Tool.”

My question is … What Inbox Repair Tool?? I can’t find such a thing anywhere. Am I blind??