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If you are looking for the most reliable manual approach to move emails from Thunderbird to Outlook then you can go through this informative article that explains the in-depth guide of the manual method to export Thunderbird emails to Outlook. However, the manual methods are too much risky to perform for non-technical users.

In that case, you can opt for the advanced and secure Thunderbird Backup Tool that will help you to backup and save your Thunderbird emails into various file formats such as PST, PDF, EML, HTML, MBOX, etc. It also allows you to remove duplicate emails from the migration process which occur more than once. Moreover, users can also migrate their emails to Office 365, Gmail, IMAP, Yahoo, Zoho Mail, and many other email clients. To evaluate its functionality, try its free demo version.