You download the OST to PST converter for free at official site of Softaken Software. To convert offline OST files in bulk, with Softaken OST to PST Converter, an Outlook-compatible program that only requires a few steps. Users can pick many OST files at once to convert them to Outlook PST. Even after using the OST Converter Tool, it keeps all of the email assets and basic folder hierarchy format. Other converter options provided by this tool include PST, EMLX, VCF, MSG, MBOX, EML, HTML, and so forth. You can also try the OST to PST Converter Tool’s demo version, which allows you to convert OST files with up to 25 items per folder.