Current Thunderbird release
| Version | New features | Complete article |
| 45 | Mail composition window and format changes, Remote content exceptions management improved, New message list and header options | New in Thunderbird 45.0 |
Past Thunderbird releases
| Version | New features | Complete article |
| 38 | The Lightning calendar add-on is now integrated into Thunderbird, Many chat and RSS related bug fixes | New in Thunderbird 38.0 |
| 31 | Autocomplete now matches any part of email or address, Autocomplete when writing to newsgroup email, NTLM authentication disabled | New in Thunderbird 31.0 |
| 24 | Enhanced tag quick search, Search order, Ignore threads | New in Thunderbird 24 |
