If you want to convert your OST files to PST, then the foremost thing you need to do is to locate the lost OST files. Once the OST file comes clean, immediately convert them to different file formats like PST, DBX, MBOX, MSG, EML, TXT, RTF, HTML, MHTML, & PDF as per your convince. Kernel for OST to PST is also better known as OST to PST convert tool.