Follow the steps below to recover Outlook OST files: Download and run OST Recovery. Click 'Open' to browse OST files from your system. Select the recovery mode and view the details of the OST file. The software will scan your browsed OST files and display all the recovered data. Choose the folders you want to restore and click 'Save.' Select the saving format as PST or others and click 'OK.' Your OST file data is successfully restored.