hello! you can try these steps
1 Click "File," then "Exit" to close Microsoft Outlook.
2 Open Windows Explorer. Browse through your file system to where Microsoft Outlook is installed. On a 32-bit Windows system, this will be "c:\Program Files\Microsoft Office\Office XX," where "XX" is the Office version number. On a 64-bit Windows system, this will be "c:\Program Files (x68)\Microsoft Office\Office XX."
3 Double-click "scanpst.exe." Click the "Browse" button and navigate to "c:\users\username\AppData\Local\Microsoft\Outlook." Double-click "archive.pst."
4 Click "Start." The utility scans your archived PST file and reports any errors or corruption in the file.
5 Click "Make Backup of Scanned File Before Repairing" if the Scanpst program finds errors. Click "Repair." Close the confirmation window when the repair is finished.