You can use WholeClear Thunderbird to EML Converter to export bulk Thunderbird files to EML files. If you need to move any size of Thunderbird mailbox to the EML file format, use this software. It also supports Thunderbird emails in any email client that supports EML, like Windows Live Mail, Outlook Express, and many others. It has performed well with any version of Windows. It has various advanced features, like bulk conversion, selected Thunderbird file/folder options, support for all versions of Windows, a free demo, and more. Read More - https://www.wholeclear.com/thunderbird/eml/