Allow HTML Temp

‘Allow HTML Temp’ provides the ability to have HTML temporarily enabled in a selected message with one click. When moving to the next message, Thunderbird will switch back to the default mode. (Author’s Site) (Thunderbird Add-ons)

Buttons

‘Buttons’ adds several new buttons to the Thunderbird toolbars such as “Forward!”, “Reply!”, and “Reply All!”. (Author’s Site) (Thunderbird Add-ons)

Contact Sidebar

‘Contact Sidebar’ adds the address book to a quick access side panel allowing you to dock your address book for quick access and to easily add messages recipients. Note: If you are running Thunderbird 2 get a compatible version here. (Author’s Site) (Thunderbird Add-ons)

Enigmail

‘Enigmail’ provides public key e-mail encryption for Thunderbird. (Author’s Site) (Thunderbird Add-ons)

GMailUI

‘GMailUI’ adds Gmail like capabilities to Thunderbird. For example, an “Expression” search type that lets you enter multiple Gmail like operators into the search field at once or you can use the Gmail shortcut keys to navigate and file your email in Thunderbird. (Author’s Site) (Thunderbird Add-ons)

Lighting

‘Lightning’ is an extension for Thunderbird that integrates Mozilla’s Sunbird calendar with Thunderbird and which allows it to perform email related calendaring tasks. (Author’s Site)

Menu Editor

‘Menu Editor’ is an extension that allows you to customize the menus in Thunderbird. (Author’s Site) (Thunderbird Add-ons)

MinimizeToTray

Minimizes the Windows versions of Thunderbird to the system tray. (Author’s Site) (Thunderbird Addons)

MR Teck Locak Install

‘MR Teck Locak Install’ provides numerous useful tweaks to Thunderbird. More for the advanced user. MR Tech Local Install will allow you to install extensions to Thunderbird that have not had their ‘maxversion’ number updated. (Author’s Site) (Thunderbird Add-ons)

NestedQuote Remover

‘NestedQuote Remover’ cleans up emails replies by deleting the deep nested quotes that are often part of long email threads. The extension can be set to automatically remove nested quotes which are deeper than a user-defined level or it can be manually activated via the context menu. (Author’s Site) (Thunderbird Add-ons)

Signature Switch

‘Signature Switch’ offers removal and or insertion of a email signature with just one click of a button. You can define different signatures and easily select them via toolbar as well as providing automatic switching based on recipients. (Author’s Site) (Thunderbird Add-ons)

Important Notes:

1. To be on the safe side before you install any of these extensions please backup your Thunderbird profile.

2. For most extensions listed below there is an author link and Mozilla Add-ons link listed. The version of the extension available at both sites may not be the same. The difference bring that the version at Mozilla Add-ons link has been tested and approved by Mozilla and is available directly from the Mozilla Update. Thus you can usually find the latest stable version of an extension on the author’s site before it appears on the Mozilla site as the whole testing and approval process takes time.

Update: Kyle Eslick has posted a similar list here that includes a few different extensions.

You can read my review of Thunderbird 2 here.

Update: If you would like to try Thunderbird 2.0 without affecting your existing version head over to Portable Apps and download the Thunderbird Portable 2.0 Pre-Release version.

Look and Feel

The newest version of Thunderbird ships with a subtle difference in the look and feel of the program. For example, the toolbar has been updated with different and brighter icons that makes Thunderbird’s interface more user friendly. It also comes with a new set of folder views. The default view is to display all of your account folders in the left pane but this can be narrowed to favorite folders, unread folders, and recent folders.

Included in this version of Thunderbird is several small additions designed to improve the overall email experience. The most useful of these additions are the so-called “folder summary popups”. Basically, summary popups act like a link mouseover popup in Mozilla Firefox. Moving the mouse over a folder with unread messages causes a small summary box to appear that displays the sender, subject and body snippet giving the reader a quick overview of a new message without having to change the current view. In addition, when new email arrives the system tray utility informs you that there is new mail in the same way.

History

Thunderbird now has history navigation through viewed messages. Most email clients contain shortcuts to move to the next and previous messages, but Thunderbird takes this one step further. Like with a browser’s history, you can navigate through the history of messages that you have viewed. For example, if you were just looking at a message in your saved message folder but are now on a message in your inbox, clicking on the back button will take you to the message that you were just looking at in the saved message folder.

Security

As with previous versions, Thunderbird will warn you about emails with links to external images and/or those emails that it considers to be possibly dangerous. Thunderbird allows you to choose to always allow images in certain emails (instead of having to click on the ‘Show Images’ button) by clicking a link which opens the address book and then whitelists the email.

Tags

Mozilla has created tags, for Thunderbird, to make it easier to organize your email. They have expanded the tag features in the version of Thunderbird. Instead of being limited to the default tags you can create as many custom tags as you like and then use the filter and/or sort features to organize tagged email. Tags can also be combined with saved searches and mail views to make it easier to organize your email.

Other Changes

Mozilla has added several other small, but welcome, improvements to Thunderbird. Thunderbird will now automatically save messages as drafts if they are in mid-composition. The RSS feature has been given new icons and the “summary popups”. Finally, Gmail and .Mac users can now access their accounts by simply providing their user names and passwords.

One other minor addition has been made to the new version of Thunderbird. Like with Firefox 2, Thunderbird now has a single dialog window, called Add-Ons, for managing themes and extensions. From this window you can install, disable, or uninstall extensions and themes. In addition, Thunderbird can check for extension updates and automatically download them.

Slightly Imperfect

Thunderbird is one of the best email clients available on the market. That being said, there are some areas where the new version of Thunderbird could be improved. They include:

• While there is a threaded view in Thunderbird, it would be nice to have a conversation view for email threads, such as what is in Gmail, where incoming emails are added to previous emails of the same conversation.
• The RSS subscription process is too confusing. The current setup requires you know how to open the Subscriptions dialog and then copy and paste the subscription link from your browser into Thunderbird. For Mozilla Firefox at least, this should be a simple process. Clicking on the orange RSS feed should allow you to add your feed to Thunderbird, like to other readers, if you so choose.
• Thunderbird lacks a full calendar solution. The Mozilla Foundation has been working on the Lightning extension project and it is becoming more and more stable. Better linkage between my calendar and email, with device synchronization, is probably the area where Thunderbird could most be improved.
• Contrary to the original roadmap, Thunderbird 2.0 does not have tabs. These tabs would work much the same as they do in Firefox allowing you to drag and drop them and have more than one message open at once. Some have dismissed this idea has a unnecessary feature but the little time I spend playing with Myk Melez’s patch has convinced me that like tabs with Firefox or Opera once you get used to them you will wonder how you ever did without.

Conclusion

As with previous versions, Thunderbird 2.0 continues to shine as an email client. While the new version mainly consists of some small tweaks and features it is well worth the upgrade. It combines both ease of use with usability and functionality and is a cross-platform application that is available for the Windows, Linux and Macintosh operating systems. As a standalone email client Thunderbird compares favorably to any email client on the market.

Note: If you want to give Thunderbird 2.0 a test drive without affecting your existing install head over to portableapps.com and download their portable version.