If you are searching to convert Thunderbird emails to Outlook then you can opt for an informative article Export Thunderbird Emails To Outlook. Here you will get the most reliable manual ways to accomplish the process. However, the manual method is soo technical to perform. Therefore, additionally, they will also provide the professional solution Thunderbird Backup Tool. The software is a full-fledged utility that saves your Thunderbird mailbox to PST, PDF, EML, MSG, CSV, etc. It also migrates MBOX emails to different email clients like Gmail, Yahoo Mail, Hotmail, Office 365, IMAP, Zoho Mail, etc. Moreover, it allows you to preview your Thunderbird mailbox and the items present in it before migration. To analyze the performance you can download it.