Mozilla Thunderbird 17.0 on Ubuntu
|Developer(s)||Mozilla Foundation (formerly Mozilla Messaging)|
|Initial release||July 28, 2003|
|Stable release||17.0.6 (May 14, 2013[±])|
|Preview release||20.0b1 (March 8, 2013[±])|
|Available in||53 languages|
|Type||Email client, news client and feed reader|
The project strategy was modeled after Mozilla Firefox, a project aimed at creating a web browser. On December 7, 2004, version 1.0 was released, and received over 500,000 downloads in its first three days of release, and 1,000,000 in 10 days.
On July 6, 2012, Mozilla announced the company was dropping the priority of Thunderbird development because the continuous effort to extend Thunderbird's feature set was mostly fruitless. The new development model is based on Mozilla offering only "Extended Support Releases", which deliver security and maintenance updates, while allowing community to take over the development of new features.
Thunderbird is an email, newsgroup, news feed and chat (XMPP, IRC, Twitter) client. The vanilla version is not a personal information manager, although the Mozilla Lightning extension adds PIM functionality. Additional features, if needed, are often available via other extensions.
Message management 
Thunderbird can manage multiple email, newsgroup and news feed accounts and supports multiple identities within accounts. Features like quick search, saved search folders ("virtual folders"), advanced message filtering, message grouping, and labels help manage and find messages. On Linux-based systems, system mail (movemail) accounts are supported. A still unsolved problem regards the possibility to archive email messages on disk. When exporting a message, by saving or dragging and dropping, the timestamp of the exported file given by Thunderbird is that of the moment in which the file was exported. For archiving reasons it would be necessary that exported file had the timestamp corresponding to the moment in which it was sent or received.
Junk filtering 
Extensions and themes 
Extensions allow the addition of features through the installation of XPInstall modules (known as "XPI" or "zippy" installation) via the add-ons website which also features an update functionality to update the extensions. An example of a popular extension is Lightning, which adds calendar functionality to Thunderbird.
Standards support 
Thunderbird supports POP and IMAP. It also supports LDAP address completion. The built-in RSS/Atom reader can also be used as a simple news aggregator. Thunderbird supports the S/MIME standard, extensions such as Enigmail and support for the OpenPGP standard.
List of supported IMAP extensions: https://wiki.mozilla.org/MailNews:Supported_IMAP_extensions
File formats supported 
- mbox – Unix mailbox format
- Mork – used for internal database
- SQLite – also used for internal database (since version 3)
Cross-platform support 
Thunderbird runs on a wide variety of platforms. Releases available on the primary distribution site support the following operating systems:
The source code is freely available and can be compiled to be run on a variety of other architectures and operating systems.
Internationalization and localization 
With contributors all over the world, the client is translated into at least 52 languages, but client's addresses are currently limited to ASCII local parts.
32/64-bit support 
|Operating System||32-bit support||64-bit support|
|Mac OS X||Yes||Yes|
Thunderbird provides enterprise and government-grade security features such as SSL/TLS connections to IMAP and SMTP servers. It also offers native support for S/MIME secure email (digital signing and message encryption using certificates). Any of these security features can take advantage of smartcards with the installation of additional extensions.
Originally launched as Minotaur shortly after Phoenix (the original name for Mozilla Firefox), the project failed to gain momentum. With the success of the latter, however, demand increased for a mail client to go with it, and the work on Minotaur was revived under the new name of Thunderbird, and migrated to the new toolkit developed by the Firefox team.
Significant work on Thunderbird restarted with the announcement that from version 1.5 onwards, the main Mozilla suite would be designed around separate applications using this new toolkit. This contrasts with the previous all-in-one approach, allowing users to mix and match the Mozilla applications with alternatives. The original Mozilla Suite continues to be developed as SeaMonkey.
On December 23, 2004, Project Lightning was announced which tightly integrated calendar functionality (scheduling, tasks, etc.) into Thunderbird, and which is now available as a downloadable extension.
On October 11, 2006, Qualcomm and the Mozilla Foundation announced that "future versions of Eudora will be based upon the same technology platform as the open source Mozilla Thunderbird email program." The project is code-named Penelope.
On July 26, 2007, the Mozilla Foundation announced that Thunderbird would be developed by an independent organization, because the Mozilla Corporation (a subsidiary of the foundation) was focusing on Mozilla Firefox development.
On September 17, 2007, the Mozilla Foundation announced the funding of a new internet communications initiative with Dr. David Ascher of ActiveState. The purpose of this initiative was "to develop Internet communications software based on the Thunderbird product, code and brand".
On February 19, 2008, Mozilla Messaging started operations as a subsidiary of the Mozilla Foundation responsible for the development of email and similar communications. Its initial focus was on the then upcoming version of Thunderbird 3. Alpha Preview releases of Thunderbird 3 were codenamed "Shredder".
On April 4, 2011, Mozilla Messaging was merged into the Mozilla Labs group of the Mozilla Foundation.
On July 6, 2012, a confidential memo from Jb Piacentino, the Thunderbird Managing Director at Mozilla, was leaked and published to TechCrunch. The memo indicated that Mozilla would be moving some of the team off the project and further development of new features would be left up to the community. The memo was slated for release on July 9, 2012. A subsequent article by the Mozilla Foundation Chair, Mitchell Baker, stated Mozilla's decision to transition Thunderbird to a new release and governance model.
Thunderbird development releases occur in three stages, called Beta, Earlybird and Daily, which correspond to Firefox's Beta, Aurora and Nightly stages. The release dates and Gecko versions are exactly the same as Firefox; for example, Firefox 7 and Thunderbird 7 were both released on September 27, 2011, and were both based on Gecko 7.0.
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