If you want to import OST file items into PST file then I would like to make your focus on eSoftTools Best OST to PST Converter application. That gives you power to make the whole conversion of OST file without installation of MS Outlook. This tool has no file size limitations and you can change unlimited OST files to PST without any data loss. It has the capability to convert the OST file into various different file formats like- PST, MBOX, CSV, EML, MSG, vCard, HTML, etc. The software always maintains data safe while converting the OST files to PST. You can easily convert up to 50 emails from OST file to PST free with its free demo version.
Get More Details- Free OST to PST Converter