You should be able, just like thousands of new Thunderbird users each year. If you have difficulties read https://support.mozilla.org/en-US/kb/getting-started-thunderbird#w_add-your-email-accounts or explain where you get stuck when setting up an account for an existing email address.

Thunderbird is a program that allows you to interact with email services such as Yahoo, Gmail, AOL, etc. The company Mozilla does not provide its own email service at this time. So, to answer your question, No, you are not able to create a "Thunderbird email account," but you can use it to connect to most email services.

Does that answer your question?

Thunderbird is a email client and not a email service. https://support.mozilla.org/en-US/kb/thunderbird-faq

Thundermail and Thunderbird Pro is coming https://blog.thunderbird.net/2025/04/thundermail-and-thunderbird-pro-services/ https://www.tb.pro/

The company Mozilla does not provide its own email service at this time.

Mozilla does have @mozilla.org emails though it is only manually provided to people who work for Mozilla in a capacity that warrants getting one. If they leave they have to give up the provided @mozilla.org email address. They do not make these available to the general public.

Also Thunderbird is developed and operated by MZLA Technologies Corporation, a wholly owned, for-profit subsidiary of the Mozilla Foundation

You can sign up to the waitlist to be informed https://tb.pro/en-US/

My understanding was that if you want to create an account - whether in Thunderbird or another email client - you already have gotten an email address from somewhere ....