If you are attempting to export Thunderbird emails using the manual way, please be aware that the manual approach is a very complex or hard approach that takes a long time to respond to you. To know the manual method, you must be a good technical person. On the other hand, if you're looking for a quick and easy solution to convert Thunderbird files to PST, Then use eSoftTools Thunderbird to Outlook Converter, which can simply convert many Thunderbird emails into PST format, including all attachments. Thunderbird emails may be converted to NSF, PST, EML, EMLX, HTML, GMAIL, and more formats. It also offers a free demo version, which allows you to test the tool before purchasing it.
Read More:- Convert Thunderbird Mailbox to PST file
One SysInspire MBOX to PST converter tool converts MBOX files to PST, DBX, MSG, and EML. It also helps you to save MBOX files on Exchange servers, Domino servers, Office 365 servers, AOL servers, and so on. There is also a free preview edition of the app available to download.
Read More:- Convert MBOX to PST