Thunderbird Pro's pricing on the official website is currently listed at $9: https://tb.pro/en-US/
That's way too much for what they're offering IMO. I'm also just interested in Thundermail and will probably never use Appointment or Send as they're not useful to me at all.
I'm comparing the price to the prices of Migadu, Mailbox.org and Posteo.de, all of which are *significantly* less expensive with a range of 1€-1.50€ per month for the base plans.
Add to all of this that Thunderbird is part of the US based Mozilla Foundation and, with the current situation there thanks to the orange fascist, I suspect Thunderbird Pro won't be popular at all after the early curiosity ends.
Thunderbird Blog: Thunderbird Pro November 2025 Update. “Welcome back to the latest update on our progress with Thunderbird Pro, a set of additional subscription services designed to enhance the email client you know, while providing a powerful open-source alternative to many of the big tech offerings available today. These services include Appointment, an easy to use scheduling tool; Send, […]
https://rbfirehose.com/2025/11/24/thunderbird-blog-thunderbird-pro-november-2025-update/
Hab mich mal für die Testphase von #ThunderbirdPro eingetragen, bin auf der Warteliste. Send und Appointment interessieren mich null, aber Mailkonto mit #JMAP-Support wäre Bombe.
https://de.wikipedia.org/wiki/JSON_Meta_Application_Protocol
#ThunderbirdPro: Early Bird subscription with 3 services included
https://technewsro.blog/thunderbird-pro-abonament-early-bird-cu-3-servicii-incluse/