I am from DRS Softech and I have some tools that can help you to migrate and recover your data in multiple file formats.

Check these tools:-
https://www.data-recovery-solutions.com/imap-to-office-365-migration.php
https://www.data-recovery-solutions.com/office-365-export-tool.php
https://www.data-recovery-solutions.com/ost-to-pst-file-converter.php
https://www.data-recovery-solutions.com/nsf-to-pst-converter.php
https://www.data-recovery-solutions.com/exchange-edb-to-pst-converter.php
https://www.data-recovery-solutions.com/compress-outlook-files.php