To convert all OST file and folders into PST Outlook, here is the best
OST to PST Converter Tool available by Enstella. This converter tool does not
require installation of Outlook to perform OST file conversion, before
converting a file into another format a smart preview is shown to the user. A
FREE DEMO pack is available; the entire user can make use of this pack for
converting up to 20 emails from each folder into each format.
Get freeware to click here- https://www.enstella.com/ost-to-pst-recovery.html