I have tried many tools to convert OST to PST file but no result was found. Then I have tried the eSoftTools OST to PST Converter tool free demo pack. It’s such an amazing tool and useful for me. You can preview your PST file data before converting to PST file. It supports conversion of unlimited size PST files within a few moments. By using this tool, users can migrate all data from the OST mailbox like emails,sent items, cc, subject, form, objects, and many items. Apart from PST, it supports several formats such as EMLX, MSG,vCard, MBOX etc. Free version of this converter tool permits the 25 emails from each folder.