For converting Thunderbird emails to Outlook PST you should go for Recoveryfix for MBOX to PST software. It can easily convert multiple MBOX files to PST, EML, MSG, and Office 365 without data loss. The software performs accurate and secure MBOX data migration from 20 email clients, including Apple Mail, Thunderbird, Zoho Mail, Eudora, WebMail, etc.
link-> https://www.recoveryfix.com/mbox-to-pst-converter/