New in Thunderbird 5

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This article describes the major changes in Thunderbird version 5. For a complete list of bugs that have been resolved in the release, refer to the list maintained on The Rumbling Edge blog or the Thunderbird Builds thread on MozillaZine. For information relevant to developers, see "Thunderbird 5 for developers" on the Mozilla Developer Network.

Note that this list was compiled as of the beta 1 build of Thunderbird version 5 and is subject to change.

Thanks to the folks at MozillaZine whose Thunderbird 5.0 - New Features and Changes article was one of the information resources used for this page..

Main improvements

Attachments

Attachments in outgoing messages

In outgoing messages, if you attach a file to a message, the size of the file is displayed in the attachment window. (This helps you avoid sending overly large files as attachments.)

Compose Attach

Attachments in incoming messages

When you receive a message that has an attachment, the attachment pane (located beneath the message pane) has new information and options.

The number of attachments and the sum of attachment sizes is displayed, as well as a button with various options. If there is only one attachment, the attachment's file name is also displayed. If there are multiple attachments, click the arrow button to the left of the attachment summary to see details for each file.

Attachment bar

The button has the following options (with "save" / "save all" as the default):

    • Open (all): You will be prompted to select or confirm the application used to open the file(s), and then the file(s) will be opened by the specified application(s).
    • Save as / Save all: You will be prompted to select the location(s) on your filesystem where the file(s) should be saved.
    • Detach (all): You will be prompted to select the location(s) on your filesystem where the file(s) should be saved, and then will be prompted to confirm that the attachments should be deleted from the message. The file(s) will still appear in the attachment bar beneath the message, but will no longer exist in the message repository. Instead, they will only exist in the location where you stored them.
    • Delete (all): Delete the file(s) from the email message.

You can access the same functionality by selecting File | Attachment from the drop-down menu.

Add-ons interface

  • The interface for installing and configuring add-ons has been updated. It now opens in a tab rather than a separate window. The "Themes" tab is now called "Appearance".
  • Thunderbird will make recommendations for new add-ons (if you have three or more add-ons already installed).

Archiving

See Archived Messages for general information about archiving.

Configure archive options

You can configure how archived messages are organized via the Copies & Folders page in the Account Settings dialog (ToolsEdit | Account Settings | <account name>):

archive configuration

  • Specify whether messages should be kept in a single folder, or in folders organized by month or year.
  • Specify whether the folder structure in the original mailbox should be replicated in the archive.

As you change configuration options, the panel at the bottom of the dialog will show you how your archive will look.

Disable archiving

You can disable archiving for one or more accounts. This will also disable the keyboard shortcut, the button on the message header and the Message | Archive menu option.

To disable archiving:

1. Open the Account Settings dialog and select the desired account from the panel on the left (ToolsEdit | Account Settings | <account name>)

2. Select Copies & Folders and uncheck "Keep message archives in".

disable message archive

Troubleshooting information

There is a new option on the Help menu that displays information about your system, account configuration, etc. This can be used to troubleshoot Thunderbird problems. For example, if you are logging a support question on the Thunderbird Support Site, you can include the information provided by this page with your support request.

You can also generate an email that includes the information on the page. Your personal information (such as your email address, account name and password and messages) is not displayed on the troubleshooting page or included in an email generated from that page. However the server names that you connect to are included on the page and in the report.

Minor changes

User Interface

Message recipients

When adding recipients to messages, by default only one address field is enabled. After entering the desired address (or using the address book to select an address), click Enter or Tab to activate another address field. Click on the button to the left of the address field to select the type of recipient ("To", "CC", etc).

addresses

Message display names

Thunderbird now uses the display name from the address book in both the message list and the message pane (assuming that the address book preference and the Reading and Display preference are both set to prefer the display name). In previous versions, only the message display was using the display name from the address book. For more information see Display name in message list and message pane.

Tabs

Tab re-ordering

You can now click and drag tabs into different positions. (The tab on the far left cannot be repositioned.)

  • Drag tabs within the main window to reposition them on the left-right axis.
  • Drag tabs outside of the main window to display the tab in a new window. (This opens a whole instance of the main Thunderbird interface, not just the message itself.)
  • Drag tabs from one window to another.

Tab options

There are new tab options that support the new tab re-ordering functionality.

tab options

  • Move to a New Window: The selected message will be opened in another instance of Thunderbird.
  • Close Other Tabs: All tabs except the currently selected tab and the tab on the far left will be closed.
  • Recently Closed Tabs: View or re-open recently closed tabs.
  • Close Tab: Close the currently selected tabs.

Automatic account configuration

The New Account Wizard has been streamlined and improved. See Automatic Account Configuration for details.

vCard import

It is now possible to import a contact file in the popular vCard file format.

From the Tools | Import... menu, select Address Books and then vCard file ( *.vcf).

Troubleshooting

Manual checks for updates

If you disable Thunderbird's automatic update checks (via Thunderbird | PreferencesTools | OptionsEdit | Preferences | Advanced | Update) you can manually check for updates by selecting Thunderbird | About ThunderbirdAbout | About ThunderbirdAbout | About Thunderbird. The Check for updates menu item has been removed from the Help menu.

Windows safe mode shortcut removed

In previous Windows versions, the Thunderbird installer created a shortcut on the Windows menu for opening Thunderbird in safe mode. This has been removed.

Restart with add-ons disabled

If you are having problems with Thunderbird, try starting Thunderbird with add-ons disabled (Help | Restart with Add-ons Disabled).


Performances

IMAP speed improvements

When changing folders, Thunderbird now displays the contents of the IMAP folder immediately (based on the cache) and then downloads new headers and updates based on sync flag changes. This makes the folder contents display more quickly. For more information, see "Faster switching to IMAP folders in Thunderbird trunk nightly builds" on Bienvenu's blog.

Compact folders enabled by default

By default, Thunderbird will now compact folders when compacting will save over 20 MB in disk space. These settings can be modified on the Thunderbird | PreferencesTools | OptionsEdit | Preferences | Advanced | Network & Disk Space menu.

JavaScript

There have been various enhancements to the JavaScript engine which provide speed improvements in the user interface.

Why did the Thunderbird version jump from 3.1.x to 5?

Thunderbird and Firefox are based on the same underlying layout engine (code-named "Gecko"). In the past, people have found it confusing that the version numbers for Firefox, Thunderbird and Gecko are all different. (In fact, we have even had to maintain charts on the Mozilla websites that show which versions of Firefox and Thunderbird map to which versions of Gecko.) Therefore, the Thunderbird group has decided to follow the initiative of the Firefox group and use the same version number as Gecko (currently "5").

In a related initiative, Firefox and Thunderbird are adopting "schedule driven" release processes, which means that we will have more frequent releases based on a fixed schedule. This will make it easier for us to provide fast security fixes, and will also allow us to ship enhancements more quickly as the process will force us to be more modular in our development approach.

Frequent releases means that Thunderbird version numbers will increment quickly. In fact, we will probably be in the double-digits by the end of this year. However, we intend to de-emphasize the version numbers (which have always been somewhat arbitrary) in our communication and simply stress that people should keep their versions up-to-date.

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