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The best method for importing Thunderbird emails into Outlook is to use the Mailvita Thunderbird to PST Converter for Mac Tool. In the Outlook PST file format, users have the ability to import Thunderbird files natively. The Thunderbird Mailbox files can be imported and exported in bulk to Outlook in the PST file format with this utility. Data from Thunderbird can be converted into an Outlook file format if you choose to do so. Emails from Thunderbird data files can be converted into the Outlook.pst file format so that attachments can be included. Installing and using this application is a simple process for Mac users. The Thunderbird to Outlook Converter App is available in a free demo version.

Visit here: https://www.mailvita.com/thunderbird-to-pst-converter-for-mac/