In my opinion, the best tool for saving Thunderbird files to PDF format is the
WholeClear Thunderbird to PDF Converter. With a few clicks, the utility can convert Thunderbird to PDF. Choose the Thunderbird account you wish to use, choose PDF format, and then click the "Convert Now" option to export. You can move the entire email with this application at once. Using the date range, to, from, subject, and other parameters, this application enables you to export Thunderbird emails to PDF files. The data and folder structure in the mailbox remain accurate despite the process.