This question today came in on moving data from one mail client to the next…
How can I export my contacts and emails from thunderbird to outlook?
The UCLA knowledge base has a step-by-stem guide on moving messages from Thunderbird to Outlook: converting messages from Thunderbird.
Another university resource, Idaho State, covers how to transfer Thunderbird’s Address Book to Outlook Contacts: importing address book contacts
As with all third party resources, YMMV.