If you have technical expertise, you can convert your OST file to PST file format manually, but if you don’t have specialized knowledge, then it is really hard to convert an OST file to PST format. In this situation, you can use third-party software with the help of an application to convert your bulk OST file to an Outlook PST. So, I suggest you try the Softaken OST to PST Converter. This conversion tool can convert your entire OST file to PST in a safe and accurate way without any data loss. With this software, you can convert your OST file to any other file format, such as EML, EMLX, MBOX, MSG, etc. The application is compatible with Microsoft Outlook versions 2003, 2007, 2010, 2013, and any subsequent upgrades. You can also try the demo version to learn more about its features.