The eSoftTools OST to PST converter tool converts various OST files to Outlook PST formats and restores lost and unavailable OST data items like addresses, contacts, tasks, calendars, journals, and other products. OST data can also be exported to Office 365, Live Exchange Server, EML, MSG, and HTML formats. Users can first download the tool's beta version and validate it, as well as convert the first 25 data files.
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OST file used when user contact exchange server for email some times there are so many resign to corrupted exchange server and ost file is not used for user to view email dux data recovery ost to pst converter software on the best software to convert ost file data in to a pst file dux data recovery support all the version of the ost file. for more info https://www.duxdatarecovery.com/ost-to-pst-recovery.php