Changelog for previous release (Thunderbird 2.0.0.0 RC 1) | Changelogs for other Thunderbird releases
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Released on 18 Apr 07, and this changelog was last updated on 19 Apr 07.
Mozilla Thunderbird 2 has been released. Release notes are available. This post lists the new features and improvements in Thunderbird 2. This list encompasses almost every single known fix that went into this release. Do check out the known issues as well. There are over 35 localizations available.
Windows Vista and 64-bit Windows is now supported, along with universal binaries for Intel Macs as well. There is a new installer for Windows (Nullsoft Scriptable Install System), in addition to Gmail and .Mac support, 3 new localizations have been added (Belarusian, Georgian & Portuguese). Lots of user interface improvements (Tags, folder views, Find As You Type, mail alert improvements [Windows and Linux only] etc.) were implemented. All in all, at least 963 bugfixes / improvements went into this release over the 1.5 branch.
New features & significant changes in Thunderbird 2:
- Tools for organizing and managing e-mail
- Be Informative
- Support for new platforms
- Automatic detection of online state
- Preference dialog redesign
- Remote image policy changes
- Two pane view using a folder location picker toolbar widget
- 3459: Spell check now also checks the subject line
- 339135: New Windows installer based on Nullsoft Scriptable Install System
- 345887, 366842: Theme updates for all platforms
- 348897: New, combined and improved Add-ons manager for extensions and themes
- 353841, 359900 : New account types – Gmail (all systems) & .Mac (Mac OS X only)
- 360588: New localizations: Belarusian, Georgian & Portuguese
- 369109: Thunderbird 2 release notes link in Help menu should point to localized documents
Changes in Thunderbird 2.0 Alpha 1: (456)
- Security issues
- Topcrashes
- Crashes
- Account manager
- Address book
- Attachment-related
- Build configuration
- Filter-related
- Functionality
- Installer
- Localization
- Networking
- Printing
- RSS
- Spelling checker
- UI improvements
- XULRunner
- Miscellaneous fixes
- Mac-specific
- Intel Mac-related
- Sun-specific
- BeOS-specific
- OS/2-specific
- AIX-specific
Changes in Thunderbird 2.0 Beta 1: (273)
- Security issues
- Topcrashes
- Crashes
- Account manager
- Address book
- Attachment-related
- Build configuration
- Filter-related
- Functionality
- Installer
- Localization
- Networking
- Printing
- RSS
- Spelling checker
- UI improvements
- XULRunner
- Miscellaneous fixes
- Mac-specific
- OS/2-specific
Changes in Thunderbird 2 Beta 2: (80)
- Security issues
- Topcrash
- Account manager
- Address book
- Attachment-related
- Build configuration
- Filter-related
- Functionality
- Localization
- Networking
- RSS
- UI improvements
- XULRunner
- Miscellaneous fixes
- Mac-specific
- OS/2-specific
Changes in Thunderbird 2.0.0.0 Release Candidate 1: (154)
- Topcrashes
- Crashes
- Account manager
- Address book
- Build configuration
- Filter-related
- Functionality
- Installer
- Localization
- Networking
- RSS
- UI improvements
- XULRunner
- Miscellaneous fixes
- Mac-specific
Note: Thunderbird 2 final release is the same build as Thunderbird 2.0.0.0 RC 1. For the en_US .zip build, the corresponding nightly is the one dated 2007032620.
The entire bug list is too large to be listed here. Instead, only the table of contents to the fixes of each Alpha/Beta/RC are shown. All feedback is welcome at the comments section below.

Mikel Ward | 14-Mar-07 at 8:32 am | Permalink
Bug 301084 doesn’t really provide conversations like GMail, it just puts replies that you wrote in the same folder as the original message.
In GMail, when you click on a message to view it, you get a collapsed list of all other messages in that same conversation, while viewing the whole message you clicked on.
Enabling this new feature and threading the message view will give you something like a conversation, but it’s hardly like GMail.
Kwong Gary | 15-Mar-07 at 12:34 am | Permalink
I’ve changed it already. Thanks for the quick feedback!
Mark Richards | 11-Apr-07 at 4:58 am | Permalink
Nice, but (always bitching):
1. lost ability to mouseclick on folder list order title (unread, favorites, recent, all) which used to cycle through them;
2. alert mail popup times out before I have a chance to read it. Might be better to keep this dialog active while mouse is inside it.
3. Calendar still sucks (can’t send email notification to self about appointment);
4. Palm sync sucks (what I can get working at all).
The good news – it’s still far better than Outlook, particularly with IMAP which in Outlook is an unmitigated disaster.
SamuÔøΩl | 18-Apr-07 at 6:17 pm | Permalink
Thunderbird 2 is released. http://releases.mozilla.org/pub/mozilla.org/thunderbird/releases/2.0.0.0/mac/
kokamomi | 20-Apr-07 at 6:53 pm | Permalink
what exactly does this mean?
“Windows Vista and 64-bit Windows is now supported”
Bob | 21-Apr-07 at 1:01 am | Permalink
kokamomi – It means that you can now use Thunderbird on Vista and you can now use Thunderbird on 64-bit versions of Windows.
Don L | 22-Apr-07 at 6:28 am | Permalink
HELP! I installed Thunderbird 2.0 from 1.5 and it won’t start. Can someone help?
Joe Nova | 29-Apr-07 at 10:58 pm | Permalink
Thunderbird still has an issue with saved emails but now instead of getting the “c is not a registered protocol” when I open up a saved email, I now get thunderbird opening up another window of itself and the saved email does not open at all. I completely wiped thunderbird out of my PC, re-installed it again and tried opening up my saved emails and still the same issue comes up where I cannot open my saved emails using it. I’ve even made it my default email program and still having the same issue.
Joe Nova | 29-Apr-07 at 11:05 pm | Permalink
Also, in the options window some of the options cannot be seen because the Window is improperly sized.
Gerhard | 05-May-07 at 9:23 pm | Permalink
Good day,
I often suffering from my need to use slow internet connections as per example GPRS. It’s than often random to access the SMTP server of my e-mail provider. I would appreciate if Thunderbird would try to connect to the mail server continously instead of annoying me with a message that the smtp server, pop3 server or imap hasn’t been reachable. If there is a slow connection this happens sometimes.
Kind regards
Gerhard
Viet Linh Nguyen | 20-May-07 at 4:00 pm | Permalink
Hi,
I’ve installed thunderbird 2 on a fresh system and surprisingly I can’t shut down thunderbird. It would restarts itself straight away and uses up nearly all the CPU capacity. Really annoying because I can’t do anything else with my computer. Had to reboot to safe mode so that I could remove thunderbird
John Yesberg | 24-May-07 at 7:52 pm | Permalink
Installed 2.0.0.0 over 1.5.0.10 and now Thunderbird won’t start. WinXP SP2. Click on the icon, and I get an hourglass for less than a second. I’ve removed profile, uninstall, clear %TEMP%, reboot, reinstall. On startup, it offers to import settings, but then nothing. Safe mode is no different. What else can I try? Arrgh!
John.