Follow the mentioned steps correctly to export OST to PST file: Download and Run the OST Converter. Select the Single File option and click Browse to add OST files. Here, check the folders to export and preview detailed information. In another wizard, select PST from the drop-down menu. According to your requirements, opt with built-in features. Tap on the Convert button to begin the conversion of OST into PST. At last, you can also save conversion reports using Download Report.