Instead of manually transferring Thunderbird local folders, a faster and more reliable option is to use a professional tool like Yota Thunderbird Converter. This software simplifies the entire process by exporting all folders from your Thunderbird mailbox while keeping the original folder structure intact. It supports batch migration, allowing you to move multiple files at once without any file size limitations.

The tool also lets you Transfer Thunderbird to new PC with all contacts in CSV or vCard formats and convert emails to formats like PST, MBOX, EML, PDF, and more—without any risk of data loss. You can even import your Thunderbird emails directly to webmail services like Gmail, Hotmail, Yahoo Mail, and other IMAP-based platforms. It also includes advanced filters for selective email migration and automatically detects Thunderbird profiles on your computer. Thanks to its user-friendly interface, it’s easy to use even for those with no technical background.