If you are looking for the best Converter to convert your erased OST files, you should use eSoftTools Free OST to PST Recovery Tool. This software is compliant with all MS Outlook versions (from 97 to 2019), and it can also be used on Windows. With the support of this tool, you can transfer OST data into various formats such as PST, MBOX, EML, EML, MSG, Yahoo, Gmail, Office 365, and HTML. You can also easily partition large projected PST archives.
Read More:- https://www.esofttools.com/ost-recovery/
Thanks a lot for the advice on a useful file recovery tool. I can also recommend the Partition Recovery https://www.diskinternals.com/partition-recovery/ program if you have problems with disk partitions on your PC or laptop.