Thunderbird 16

• The SMTP issues with enterprise and educational accounts on outlook.com have been fixed in #10312.
• The following issue was fixed in TB 16.1 which was released one week after Thunderbird 16.0. Known Issue: Deleted/read messages in your unified inbox may not update until you manually refresh. We hope to have a fix soon. you can can follow along on issue: #10243

Thunderbird 15

• There are further SMTP issues with enterprise and educational accounts on outlook.com and the team is testing a fix. You can follow along on issue #10312. It looks like this will fixed in the next release, TB 16.

Thunderbird 14

• SMTP issues with enterprise and educational accounts on outlook.com have been fixed.

Thunderbird 13

• The notification in status bar re-appearing multiple times a day issue (github issue #8049) has been fixed.
• Special folders (Trash, Sent, Drafts, Archives, etc) not appearing after updating from TB11 to TB12 (github issue: #9771) was fixed.
• The bug with outgoing email not working for certain educational and enterprise accounts is scheduled to be fixed in the next release, Thunderbird 14 for Android (github issue: #9160).

Thunderbird 12

• If you use a password manager, Android will now use it to automatically fill in your password when you add a new account.

Thunderbird 11

• Mail folders are easier to navigate.
• Algorithmic darkening makes reading emails easier in dark mode.
• Thunderbird 11.1 : Selected/read/unread message states are now easier to distinguish visually.
• You can still see font settings if you search for font in Settings. This will be removed in a future Thunderbird release. Please use the Android operating system font size settings instead.

Thunderbird 10

• You can now empty your Spam folder by tapping Empty Spam in the Spam folder's menu ⋮ (also known as the kebab menu because the 3 vertical dots resemble a kebab).
• On Android 10 or older, you now have an option to use the system theme.
  1. Tap ≡ at the top left > tap the gear icon: at the bottom left.
  2. Tap General settings > tap Display > tap Use system default under Theme

Thunderbird 9

• Initial Android 15 support.
• Thunderbird attempts to use your email provider's auto configuration database. If it fails it, it uses Mozilla's database.

Thunderbird 8

• Refer to New in Thunderbird for Android version 8 please.