As per my personal experience, I suggest the shoviv eml converter tool. This eml conversion toolkit comes with handy features which make your email conversion and migration more accurate and precise. The trial version of this tool is totally free, which allows one to convert/migrate 50 items from each folder. Try this tool. I bet you will never regret your decision.
Following are related blogs you will definitely check out.

1. https://www.shoviv.com/blog/how-to-convert-emails-from-eml-to-pst-file-for-outlook/
2. https://www.shoviv.com/blog/windows-live-mail-to-outlook-2016-2019/
3. https://www.shoviv.com/blog/how-to-import-eml-to-outlook/
4. https://www.shoviv.com/blog/windows-live-mail-to-office-365-migration-tool/
5. https://www.shoviv.com/import-eml-to-office-365.html