Thunderbird 3 Beta 1 Release Notes

Thunderbird 3 Beta 1 is a preview release of the next major version of Thunderbird. It is available for testing purposes only and is intended for developers and our testing community.

This release does not represent the final product. Some of the features listed below are highly experimental and will likely change before the final release. They may come with crashes and bugs and may potentially cause data loss in profiles (configuration data, preferences, and downloaded mail).

Please do not use Thunderbird 3 Beta 1 in a production environment.

Please see below for a list of features and enhancements found in Thunderbird 3 Beta 1, as well as known issues and frequently asked questions. As always, we appreciate your feedback either through this feedback form or by filing a bug in Bugzilla.

What's New in Thunderbird 3 Beta 1

Thunderbird 3 Beta 1 is based on the Gecko 1.9.1 platform which has more than 10,000 updates including some major re-architecting to provide improved performance, stability, web compatibility, and code simplification and sustainability.

There are over 750 changes in this release, many laying the groundwork for future changes. Some notable changes include:

User Experience Improvements

Tabbed Email

Email messages, folders, and calendars (with the Lightning extension installed) can be opened in tabs.
Improved Message Reader View
This is the first stage of a series of refinements to the message reading experience. The first stage brings email controls closer to the area in which the user is operating.
New Add-ons Manager
The new Add-ons Manager (Tools > Add-ons) can now be used to find, download, and install Thunderbird Add-ons which includes Extensions, Themes, and Plugins. Note that few Add-ons are compatible with this beta at the time of release, as Add-on developers need to upgrade them.
Improved Address Book
If someone is in your address book, it is indicated by a new star icon which you can click to edit contact details inline. If they are not in your address book, you can add them with one click of the icon. A new birthday field allows you to keep track of your friends' birthdays.
For Windows Vista users, Thunderbird 3 Beta 1 is now integrated with Vista search results. On first start, Thunderbird will prompt to install its indexing system into Windows Vista and you can choose to see Thunderbird email and news messages in Windows search results.

For Mac users, Thunderbird 3 Beta 1 can import from Mail.app, read your OS X address book, and use Growl for new mail alerts.

Performance improvements

Faster Message Loading for IMAP
Thunderbird will now download IMAP messages in the background to allow for faster message loading, and better offline operation. This feature can be enabled on an individual folder basis (via folder properties), or for all folders in an account, via Account Settings / Sync & Disk Space.

For a more detailed list of bug fixes, see the Rumbling Edge.

Downloading and Installing

System Requirements

Before installing, make sure your computer meets the system requirements.

Please note that Thunderbird 3 Beta 1 no longer supports versions of Windows prior to Windows 2000 (e.g. Windows 95, 98, ME and NT) and Mac OS X versions prior to 10.4 Tiger. Linux requirements have also changed. Do ensure that compatibility mode for unsupported Windows platforms is disabled for the Thunderbird executable in Windows.

Downloading Thunderbird 3 Beta 1

Mozilla Messaging provides Thunderbird 3 Beta 1 for Windows, Linux, and Mac OS X in a variety of languages. You can get the latest beta version of Thunderbird 3 here.

Installing Thunderbird 3 Beta 1

Please note that installing Thunderbird 3 Beta 1 may overwrite your existing installation of Thunderbird on Linux. Windows and Mac OS X will install to different locations, however it is recommended that you check the messages during installation. For all systems, you won't lose any of your messages or address books, but some of your extensions and other add-ons might not work until updates for them are made available.

Users are highly encouraged to install Thunderbird 3 Beta 1 in another folder (on Windows, this is done using Custom Install) and backup their profiles before testing Thunderbird 3 Beta 1.

Removing Thunderbird 3 Beta 1

You can remove Thunderbird 3 Beta 1 through the Control Panel in the Start Menu on Windows, by removing the Thunderbird application on OS X, or by removing the thunderbird folder on Linux.

Removing Thunderbird 3 Beta 1 won't remove your emails or newsgroup messages. This data is stored in your profile folder, which is located in one of the following locations depending on your operating system:

Windows Vista	Users\<UserName>\AppData\Roaming\Thunderbird
Windows 2000, XP, Server 2003	Documents and Settings\<UserName>\Application Data\Thunderbird
Mac OS X	~/Library/Thunderbird
Linux and Unix systems	~/.thunderbird

Any version of Thunderbird that you install after removing Thunderbird 3 Beta 1 will continue to use the data from this profile folder.

Extensions and Themes

Extensions installed under previous versions of Thunderbird may be incompatible and/or require updates to work with Thunderbird 3 Beta 1. Please report any issues to the maintainer of the extension.

When you install Thunderbird 3 Beta 1 all of your Extensions and Themes will be disabled until Thunderbird 3 Beta 1 determines that either a) they are compatible with the Thunderbird 3 Beta 1 release or b) there are newer versions available that are compatible.

Known Issues

This list covers some of the known problems with Thunderbird 3 Beta 1. Please read this before reporting any new bugs.

All Systems

The toolbar drop down folder picker does not work in Beta 1.
The extended columns in the folder pane have been removed in Beta 1. There is an add-on that restores the functionality.
If using SSL or TLS, and the certificate that comes from the server is self-signed, expired, or has a domain that does not match the server domain, a dialog will be shown asking if Thunderbird should permanently make an exception for the cert. This should only be done if the error is understood.
Manual IMAP folder offline download does not work in Beta 1, but imap messages are automatically downloaded in the background by default. See (bug 468155)
There is no confirmation when deleting saved searches or deleting folders from the trash. See (bug 468081)
Javascript has been disabled due to security issues (bug 453928) and (bug 453943).
Ensure extensions either come from a secure server using the HTTPS protocol or are digitally signed, or they will fail to install.

Microsoft Windows

Make sure Windows 95/98 compatibility mode is disabled for the Thunderbird executable. The setting will be inherited from previous Thunderbird installations if the original directory is over-written. Certain issues will go away once the compatibility mode is disabled (Bug 381922).

Mac OS X

Removing the junk button from the toolbar will crash (bug 455098).

Troubleshooting

Poorly designed or incompatible extensions can cause problems with your email client, including make it crash, slow down message display, etc. If you encounter strange problems relating to parts of the email client no longer working, the email client not starting, windows with strange or distorted appearance, degraded performance, etc, you may be suffering from Extension or Theme trouble. Restart the email client in Safe Mode. On Windows, start using the "Safe Mode" shortcut created in your Start menu or by running thunderbird.exe -safe-mode. On Linux, start with ./thunderbird -safe-mode and on Mac OS X, run:
cd /Applications/Thunderbird.app/Contents/MacOS/ ./thunderbird-bin -safe-mode
When started in Safe Mode all extensions are disabled and the Default theme is used. Disable the Extension/Theme that is causing trouble and then start normally.
If you encounter strange problems relating to email, feeds or newsgroup messages, it is recommended that you try creating a new profile and attempting to reproduce the problem before filing bugs. Create a new profile by running Thunderbird with the -P command line argument, choose the "Manage Profiles" button and then choose "Create Profile...". Migrate your settings files (Emails, feeds, etc) over one by one, checking each time to see if the problems resurface. If you do find a particular profile data file is causing a problem, file a bug and attach the file, being sure to remove any private information as necessary.

Frequently Asked Questions

What can I do to help?
We need help from developers and the testing community to provide as much feedback as possible to make Thunderbird even better. General feedback can be provided via the feedback form. Please read these notes and the bug filing instructions before reporting any bugs to Bugzilla.
Where can I discuss Thunderbird 3 Beta 1 features or issues?
If you want to join the conversations about new features or need troubleshooting advice, check out the MozillaZine forums. You can also post questions in the "mozilla.support.thunderbird" newsgroup, available on Mozilla's news server, or via the web, using Google Groups. It is also available as a mailing list. Please read the Mozilla Forum Etiquette page before posting.
Where can I get extensions and themes (add-ons)?
Extensions and Themes can be downloaded from Thunderbird Add-ons.

Note that because this is an early alpha, most add-ons won't be compatible with it until the add-on developer explicitly upgrades their add-on.
Who makes Thunderbird 3 Beta 1?
Many people! Mozilla Messaging is the organization that produces it, but it is the result of collaboration between hundreds of people around the world.
Where's the Thunderbird 3 Beta 1 source code?
A tarball of the Thunderbird 3 Beta 1 source code is available for download. The latest development code can be obtained by Mercurial. For more details on the layout of the source, see the comm-central information page. Please follow the build instructions.