Windows Live Mail is popular and Outlook express, Thunder bird are email clients of EML files. If user want to save EML files in Outlook 2019, 2016 and 2010. You can continue this migration with manual methods well mentioned in this blog. Generally users migrate EML files in Outlook, because of its all new features which are not available in EML clients. To create back up for EML files user save these files in Outlook PST format. To know more detailed information about these methods, visit:
https://www.datarepairtools.com/blog/import-eml-files-to-outlook/