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Mozilla Messaging pushed the stable release of Thunderbird 3 out of the nest on Tuesday, and there's a lot to like in case you haven't been following the beta development of this Outlook alternative. The long-overdue Thunderbird 3 is available for Windows, Mac, and Linux, and it introduces several hefty new features and some long-needed improvements, including an overhauled search and message indexing, tab support, and a revamped setup wizard that's designed to make new account setup quick and painless.

One feature that isn't included is the calendaring add-on, Lightning. Originally, Mozilla had planned to bake the extension into the program, but decided back in February 2009 to change course and leave it up to users to download. Although Thunderbird natively comes with Microsoft Exchange support, there's no calendar and therefore no meeting support in the default Thunderbird installation. Along with Lightning, there's an essential Google Calendar add-on for Lightning that gives Google users calendar support in Lightning. Currently, the only version of Lightning that works in Thunderbird 3 is the nightly build, available here.

Even without Lightning, Thunderbird makes for an excellent desktop-based e-mail client. Beyond Outlook replacement, it also makes a savvy offline or local-storage tool for the various Web mail providers. Gmail integration has existed in Thunderbird for a while, but improvements in version 3 include better recognition and integration of Gmail's special folders. These include Sent and Trash, and the non-English versions of Gmail. The All Mail option in Gmail defaults in Thunderbird to the Archives folder.

Thunderbird 3's new search results pane.

(Credit: Screenshot by Seth Rosenblatt/CNET)

Undeniably, the killer feature in Thunderbird 3 is the search. The most obvious competitor, Microsoft Outlook, doesn't offer anything that comes close to the level of granular control that Mozilla has given Thunderbird users. The new search bar is dominant at the top of the interface, and is set by default to search all messages. When you search, a new tab will open with your results organized as shown in the screenshot above. Filters based on e-mail addresses, folders, and tags appear on the left, while the majority of the window is given over to displaying summaries of the e-mails that meet your criteria. There's also a timeline bar graph at the top of the results. Click it, and then mouse over any of the subcategories to see how they occurred over time.

You can change the search box to one of several filters, including Subject, From, Recipient, To, CC, and Message Body. Frustratingly, you can't filter by Tag. You can also save any of these filtered searches as a virtual folder. Editors' note: The previous two paragraphs have been rewritten for clarity.

The new search bar drops down with options, but also can do predictive on-the-fly queries similar to the URL bar in Firefox 3.

(Credit: Screenshot by Seth Rosenblatt/CNET)

There is one drawback to the search: the first time it indexes your messages, you're potentially in for a long, long wait. In testing, this depended entirely on the number of messages in your folders. High volume accounts, whether locally archived or all on a server, should probably set their indexing to run overnight. After the first indexing, each new e-mail is added as it comes in.

E-mails open by default into new tabs, making the e-mail reading experience far more similar to the Web-browsing one. This can be toggled under the Advanced section of the Options, under the Reading and Display tab. The hot keys for the e-mail tabs have been mapped the same as in Firefox, so middle-click an e-mail to open it in a new tab but retain your focus on the current tab. The CTRL+Tab hot key combo will cycle through your tabs, and there's an open tab button on the right side of the tab bar to help manage your tabs.

There's a new activity manager that records all interactions between your e-mail provider and Thunderbird, making it easier to track down errors when you send or receive mail. There's also an entirely new system for archiving messages based on Gmail's "archive and forget it" method. The new version offers the traditional multiple-folder-based solution, as well as the new dumping-ground style, which can be activated via the "A" hot key. Thunderbird 3 supports Firefox personas, too, further reinforcing their shared architecture.

Thunderbird 3 beta 4 introduces tighter folder integration for Gmail users.

(Credit: Screenshot by Seth Rosenblatt/CNET)

Other changes include major code improvements. The setup wizard now looks to mozillamessaging.com for additional information on how to configure the account. This changes how new Web mail accounts are created. Mozilla has said that only the domain name from your e-mail address gets sent to Mozilla's servers, and that the entire process falls under the Mozilla's privacy policy. Nevertheless, it's a move that's likely to cause some concern among privacy advocates.

The compact header mode has been deleted, which is sure to annoy those who like using Thunderbird on smaller-form computers like Netbooks. Windows users should see Thunderbird results appearing in federated searches in Windows Vista and Windows 7, while Mac users will find Growl notification support for new e-mails, integration with Spotlight and the Mac OS X address book, and support for Mail.app. The full changelog for Thunderbird 3 can be read here.

Thunderbird 3 rates as a top-notch e-mail client, and it's definitely the best freeware one around. It will require some fidgeting to get it to be usable in a corporate environment, but it's far more scalable to user needs than anything else currently available.

Mozilla updated its nearly-baked Thunderbird 3 Tuesday night, fixing one critical error and addressing three others. The critical bug fix affects the Windows, Mac, and Linux versions of Thunderbird 3 Release Candidate 2. It had caused the previous version to hang on shutdown, consume too much memory, and close all IMAP connections.

The other fixes in this version enable downloading new messages automatically by default for POP3 accounts, label the default theme as version 2.0, and fixes the "download more dictionaries" option, which had been failing to open properly.

Already a year off from its original release schedule, Thunderbird 3 has also missed its most recent revised deadline, which had been planned for the end of November 2009. However, I've been using the beta and release candidate builds and have found them to be as stable as Thunderbird 2, but with far less memory hogging.

Mozilla Messaging has released the first release candidate of a Thunderbird 3, software it hopes will significantly improve how people read, write, catalog, and search their e-mail.

Mozilla released the software Tuesday for Windows, Mac, and Linux, several days later than predicted earlier this month but close to a year later than Mozilla planned in 2008. A final version of Thunderbird 3 is expected not long after the release candidate.

Thunderbird 3 has been years time in the making. For its next versions, the Mozilla Messaging group hopes to release new versions more frequently, said Mozilla Messaging programmer Dan Mosedale.

"Part of the plan for Thunderbird is to move our development process in a more agile direction...Rather than having super long releases, we'd like to release significantly more frequently than we have historically done," said a draft Mozilla proposal for what to do in the post-Thunderbird 3 era Mosedale posted. He proposed major Thunderbird releases every four to six months, starting with version 3.1, and also laid out some ideas for Thunderbird after version 3.1.

Thunderbird 3.0 adds a variety of features, according to Mozilla and the Thunderbird 3 RC1 release notes:

• A more elaborate search option to locate specific messages. People can employ a variety of methods to sift the wheat from the chaff.

• An e-mail archive a la Google's Gmail. Rather than filing every message in a folder, an organizational technique that can be hard to maintain with high volumes of messages, people can move them out of the inbox into the archive where search can find them later.

• A streamlined interface that cleans up the toolbar and moves some of its functions to the frame around e-mail messages.

• A new plug-in system designed to be easier to use to replicate some of the success of the Firefox browser. The browser, by the way, is built in so plug-ins can use it.

• A tabbed interface that can reduce clutter of e-mails, e-mail folders, and other tasks. A tab can, for example, house a version of Yahoo's online calendar.

• An easier process to set up new e-mail accounts. The software has preset settings for several e-mail services.

• "Smart folders" that can be customized in a variety of ways. For example, users with multiple e-mail accounts can create a smart folder that provides a unified inbox for all the accounts.

• An easier way to add people to the address book by clicking a star icon next to the sender's name.

Be sure to check the list of Thunderbird 3 RC1 issues if you're the cautious type.

MOUNTAIN VIEW, Calif.--Thunderbird 3, an update to the e-mail software that Mozilla hopes will give it some of the advantages its Firefox browser has enjoyed, is due to arrive in near-final form next week.

Mozilla Messaging plans to issue release candidate 1 of Thunderbird 3 as soon as Monday, with the final version expected later in November, the e-mail-focused subsidiary of the Mozilla Foundation said Thursday.

"We're down to the last few bugs," said Chief Executive David Ascher. "Feedback with the last beta was enthusiastic." Thunderbird 3 beta 4 can be downloaded for Windows, Mac, and Linux.

Mozilla Messaging CEO David Ascher

(Credit: Stephen Shankland/CNET)

Thunderbird doesn't get as much attention as Firefox, the chief product of the Mozilla Foundation's other subsidiary. But with Thunderbird 3, Ascher and Mozilla Messaging are trying harder to take advantage of one technology that's helped the browser's fortunes: add-ons. They could be written for Thunderbird 2, but only with what Ascher termed an act of heroism; Thunderbird 3 makes add-ons much easier.

One area where add-ons show up is a new Thunderbird 3 feature, Google and Yahoo calendar functions in the software--using its built-in Firefox engine for handling Web pages, naturally.

"There are a bunch of actions that start in e-mail that really involve the Web," Ascher said. Another example he said Mozilla Messaging will write if some enterprising person doesn't do it first: an add-on to help people assess whether to follow a particular Twitter user who just signed up to follow you.

Another add-on that's already under way is Lightning, which parallels Outlook's calendar functions. A Thunderbird 3-compatible version should arrive about the same time, he said. Ultimately, Thunderbird should be able to integrate with either Lightning or Web-based calendars, including the automation of operations such as accepting event invitations.

Better search
The add-ons also dovetail with a significant new Thunderbird feature, improved search. With Thunderbird 2's folder-based search approach, people often didn't set up searches so they could find what they needed. With Thunderbird 3, it returns all results that match the text, not just what's in a particular folder.

"It's really important to search everywhere," Ascher said. As with Google, "You type a word, and you get results."

Of course that can retrieve a lot of unwanted results. So the search results page offers a variety of ways to winnow that search down--limiting it to particular people, to messages with a specific tag, or to a particular time frame selected from a timeline that presents messages using the search term.

These functions to refine the search, which Mozilla Messaging calls "facets," are another area where add-ons can help, Ascher said.

Also coming in Thunderbird 3 is a simpler start-up process. The software is set up in advance to automatically set up the increasingly complicated server configuration for various accounts. I tried it with Gmail, and it indeed was up and running in moments after I entered only my name, e-mail address, and password. The software comes with several profiles built in, and it makes intelligent guesses if it doesn't know, but people will be able to write their own modules that can be shared, too.

Another feature in the new version is the archive, a feature borrowed from Google's Gmail that's a kind of digital purgatory. E-mails sent to the archive are still available through search, but they don't clutter up the inbox. Folders are still available for those who want to file messages the traditional way.

"The original idea of e-mail, putting messages in folders one by one, was reasonable when we got ten messages a day. Now that we get a couple hundred or more, that's a huge burden," Ascher said. "We made archive really easy and complemented it with (an) easy-to-use search experience.

Streamlined interface
One big interface change is the addition of tabs. Mail accounts, folders, and individual messages can show as new tabs rather than new windows. It's one of a number of efforts to provide a more streamlined interface.

One other is moving some message-specific operations to the message window--reply, reply to a mailing list, forward, archive, and other options. Another: the main toolbar has been cleaned up so only essential actions show, though others can be added through customization. And people can be added to the address book with a single click of a star next to their names--not unlike Firefox 3.5's one-click bookmark operation.

Some routine tasks--labeling a message as junk, for example--are designed to be faster, he added.

"If you look at the number of seconds saved over the population of Thunderbird users, it tends to be several lifetimes per year," Ascher said.

One new feature in Thunderbird 3 is a simplified account setup. You enter three bits of information, and Thunderbird often can take it from there.

(Credit: Screenshot by Stephen Shankland/CNET)

Do you pine for the Netscape Communicator days with unified browser and e-mail software but want something more current? Mozilla on Tuesday released SeaMonkey 2.0, which combines Firefox and Thunderbird.

The new version, for Windows, Mac, and Linux, is rebuilt with Firefox 3.5.4 and is more closely aligned with the standalone browser. "SeaMonkey is now much closer to Firefox as far as user profiles, add-ons, and functionality of user interface elements are concerned," according to the release notes. Among other changes:

• Retrieving e-mail using the IMAP (Internet Message Access Protocol) protocol is faster, and for new IMAP accounts, mail is synchronized by default with the local computer.

• The Mozilla Lightning calendar plug-in for Thunderbird can be used.

• E-mail accounts, folders, and messages can be viewed in tabs.

• The mail module lets you subscribe to RSS and Atom feeds that the browser discovers on Web pages.

• The browser is faster at running Web-based JavaScript programs and supports a variety of modern Firefox features coming with the HTML5 standard.

• Browser tabs can be reopened after being closed, and tabs are reloaded if the browser crashes.

• The user interface for handling add-ons, passwords, forms, cookies, and downloads have been overhauled.

• The Mac OS X theme fits in better with the look of Leopard and Snow Leopard, the previous and current versions of the Apple operating system.

• Several older operating systems are no longer supported: Windows 95, 98, Me, and NT 4 as well as Mac OS X 10.2 (Jaguar) and 10.3 (Panther).

The software is available as a download for Mac OS X, Windows, and Linux in 18 languages.