The best option for importing a PST file into Outlook 2010 is to use the eSoftTools Outlook Recovery Tool. A large PST file can be split into several smaller files of varying sizes, ranging from 1 GB to 25 GB. The software's user interface is uncomplicated and simple to use. Combining non-technical and technical skills is simple. The trial version of this software enables you to import PST files. The trial version allows you to convert up to 25 emails per folder.