I suggest the best method to quickly migrate OLM to PST file so you can try automated software OLM to PST Converter.
. It is very easy to transfer data single and multiple files without any data loss.
. The Message Filtering option helps the users to select OLM items between two dates and start the conversion process.
. This tool also supports all popular MS Outlook version 2019, 2016, 2013, 2010, 2007, 2003 and etc.
You can try this way also-
Launch the Gmail account by providing credentials to initiate the process to convert OLM to PST manually. Click on the gear button from the top corner of Gmail and click on Settings option to convert OLM to PST file format. From the Settings page go to the Forwarding and POP / IMAP tab.
I hope this will help
Use the best OLM converter tool and transfer all the OLM files to Outlook PST file format in just a few minutes. The tool can move OLM mailbox into EML, PST, MSG, EMLX, etc. The tool offers bulk conversion and a user can move the files of any size. Visit:- http://www.olm.pstfile.org/