OST file also known as Offline Storage Table is a file that is housed locally on user’s computer and facilitate users to work offline when Exchange Server is down. Due to the corruptions in OST files Outlook 2007 users may experience an error message “Errors have been detected in the File Outlook.ost”.
The error may occurs due to any one of the reasons like virus attack, abnormal Outlook shutdown or Improper System shutdown.
You can use inbuilt scanost.exe application to fix these kind of error messages from outlook application. In Outlook 2007, users can found this tool at this location:
C:\Program Files\Microsoft Office\Office12
This will try to fix this issue. In case if you still not able to fix this message then try this OST to PST Converter Application to resolve the issue