With the help of Outlook ost to pst conversion tool, you can convert single as well as multiple files without disturbing the integrity of the database. The free ost to pst file converter software to transfer ost file to new outlook format. This OST export tool is the 100% capable to restore files of  ms outlook ost file  and also export OST to office 365 & live Exchange Server. Import exported PST file in Outlook application to access all your emails, contacts, calendar, and Attachment, etc.