How Do I Transfer My Windows Live Mail Messages to Thunderbird?
To move your Windows Live Mail messages to Thunderbird, you first need to convert the .eml files (used by WLM) into the MBOX format, which is Thunderbird-friendly.
Here’s how:
Use Advik Windows Live Mail Converter to convert your email folder into a single MBOX file.
After conversion, open Thunderbird.
Use the ImportExportTools NG add-on in Thunderbird to import the MBOX file.
This approach is clean and doesn’t mess up your folder structure. It works especially well for users with large mailboxes and attachments.
Learn More: https://www.adviksoft.com/windows-live/mbox.html
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charlottemiller commented
To transfer Windows Live Mail messages to Thunderbird, you need to convert EML files to MBOX format. EML files support Windows Live Mail; on the other side MBOX is used by Thunderbird. Many free tools available to transfer EML files to MBOX but these tools requires technical expertise. That's why I recommend you to use the DataVare EML to MBOX Converter. This utility instantly transfer batch EML files to MBOX and supported email clients. It is useful for beginner as well as expert users. This tool works without any email clients and provides accurate results.
Read More: https://www.datavare.com/blog/windows-live-mail-to-thunderbird.html