Before purchasing any paid software, one must try an easy manual trick that can move mailbox data stored in OLM files to Windows Outlook. And the manual trick doesn't require any paid software or any other cost. You just need to do these things (on by one):
  • Create an IMAP mail account first.
  • Now set up this new IMAP mail account with Outlook for Mac.
  • Create a Gmail label to synchronize IMAP mailbox folder with Outlook for Mac.
  • Transfer mailbox content from OLM files to IMAP mailbox folder.
  • Now move IMAP mailbox folder data to Windows Outlook.

Read this blog post for detailed information - wordpress.semnaitik.com/2014/02/13/convert-olm-to-pst/

I hope it would be helpful here.

Thanks and best regards.