To export OST files into PST format for Outlook, you can utilize third-party software or use a manual method if you have technical expertise, but there are lots of restrictions with the manual method, and this method is not approached by most users, so in this situation, the best way to export an OST file to PST format is to use a third-party application like ToolsBaer for OST to PST Conversion Software. With the help of this utility, you can easily export the bulk of the OST file to PST format. It converts OST files to PST and saves the results at a location selected by the user. It might be any appropriate folder, fresh or old. Users of Windows 10, 8, 8.1, and 7 can easily utilize this application. There is also a free version of this program.