We used it to read old Outlook backups at my previous employer. Haven’t used it as an active client.
If you buy your own domain, you can connect it to an account like Proton or Tuta, making your personal email a little more portable. Last I checked, .nl domains were like $6 or $7 per year on Namecheap. And I'm pretty sure you can link both Proton and Tuta to a Thunderbird client if you really want to. You may need a paid account with the email provider if you want to link a custom domain, I can't recall offhand.
It's pretty good, but I use SeaMonkey since it feels more lightweight
Thunderbird is great if you like using an email client that looks like its user interface was designed in 1996.
Firefox
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