There are various OST and PST. Software is available, but only a few are best at their work. But as per your question, you want the best OST to PST tool to convert an OST file, so I suggest an efficient application. You might try the SameTools to convert OST to PST. You can convert your OST file to PST format, as well as a variety of other file formats, including MSG, EMLX, MBOX, and EML, with this tool. In a few simple steps, you can convert your bulk OST file to PST format. All versions of Microsoft Windows, including 7, 8, 8.1, and others, are compatible with the software. Furthermore, a complimentary trial version of the software is accessible.