How to convert Offline OST file to PST without alteration of single file? Just easy to opt one of the best OST to PST Converter Tool and follow the simplest working steps of OST file conversion in Outlook alongwith attachments. Its batch function and preview function is the highlighted and advance options of software that helps to perform large data migration at a time and brief viewing OST mails. To know more about the OST file conversion in Outlook process, you should go with the free trial button of OST to PST software so that you will perfectly understand entire process before to but it.