Use DRS OST to PST Converter for the most sufficient and reliable tool to convert OST files into Outlook PST files. You can get so many advanced features like a mail filter, preview data, and removing duplicate emails. It also provides the option to add multiple files at a one-time conversion. It has a simple and attractive GUI for users so that they can easily complete conversion. A free version of OST to PST Converter Tool is available to understand the working of the software.