To recover a PST file, you can start by checking the Recycle Bin for any recently deleted files. If the file is not found, you can use Outlook's built-in repair tool, ScanPST, to try and repair a corrupted PST file. If this method doesn’t work, you may need to rely on a specialized tool like the DRS Softech PST Recovery Tool to recover lost data from the PST file. To avoid data loss in the future, it’s always a good practice to back up your PST files regularly.

Steps to recover a PST file using ScanPST:
1. Locate ScanPST: Close Outlook and find the location of the ScanPST.exe file on your computer.
2. Open ScanPST: Double-click on ScanPST.exe to open the tool.
3. Select PST file: Click on "Browse" to choose the PST file you wish to repair.
4. Start scan: Click "Start" to begin scanning the PST file for errors.
5. Repair process: If errors are detected, click "Repair" to attempt to fix them.

Read More: https://www.data-recovery-solutions.com/pst-recovery.php