Hello,
Can you please tell that whether you want to move Thunderbird contacts only or the other data also? Because there are different solutions for both. Still, as per your question, you can go through the following informative blog, discussing a manual method to import Thunderbird contacts into Outlook account. The given solution is really easy and trouble-free.
http://lettoknow.com/no-issue-thunderbird-address-book-to-outlook-conversion/
If you have any doubt, feel free to ask anytime.