Lightning (software)

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Developer(s)Mozilla Foundation / Mozilla Corporation
Initial release0.1
Stable release6.2.6.1 (March 25, 2019; 3 years ago (2019-03-25)[1]) [±]
Preview release6.8b3 (Beta) (March 8, 2019; 3 years ago (2019-03-08)[2][3]) [±]
Written inC++, XUL, XBL, JavaScript
Operating systemLinux, Windows, macOS, others
Available in50 languages
TypePersonal information manager
LicenseMPL 2.0

The Lightning project, announced on December 22, 2004, and currently developed by the Mozilla Foundation, produces an extension that adds calendar and scheduling functionality to the Mozilla Thunderbird mail and newsgroup client and SeaMonkey internet suite. Lightning is an iCalendar compatible calendar.

Unlike the discontinued Mozilla Sunbird and Mozilla Calendar extension, Lightning integrates tightly with Thunderbird.[4]

Lightning is available in 32-bit and 64-bit versions for Windows, macOS and Linux, and is installed by default on Thunderbird.


Version 0.9 was the last planned release for Thunderbird 2. A calendar was originally to be fully integrated into Thunderbird 3, but those plans were changed due to concerns with the product's maturity and level of support.[5][6] Lightning 1.0b2 is compatible with Thunderbird 3.1, Lightning 1.0b5 is compatible with Thunderbird 5 and 6, and Lightning 1.0b7 is compatible with Thunderbird 7.[7][8] Lightning 1.0 was released to the public on November 7, 2011. It was released alongside Thunderbird 8.0. Following that, every Thunderbird release has been accompanied by a compatible Lightning point release. Lightning finally started shipping with Thunderbird with version 4.0. As of 21 October, 2018, Lightning 5.4 is incompatible with the latest release of Thunderbird 60.2.1.

Sun Microsystems contributed significantly to the Lightning Project to provide users with an alternative free and open-source choice to Microsoft Office by combining and Thunderbird with the Lightning Extension.[9] In addition to general bug-fixing, Sun focused on calendar views, team/collaboration features and support for the Sun Java System Calendar Server.[10]

See also[edit]


  1. ^ "Calendar Versions - Mozilla | MDN". Retrieved 2019-03-27.
  2. ^ "Lightning :: Versions :: Add-ons for Thunderbird". Retrieved 2019-03-27.
  3. ^ "Calendar Versions - Mozilla | MDN". Retrieved 2019-03-27.
  4. ^ Lightning Project Launched to Provide Calendar Features for Mozilla Thunderbird- MozillaZine - MozillaZine article announcing the Lightning project and its aims.
  5. ^ "Lightning 0.9 Release Notes". September 23, 2008. Retrieved June 22, 2010.
  6. ^ David Ascher (February 18, 2009). "Lightning-in-Thunderbird status update". Archived from the original on October 2, 2010. Retrieved June 22, 2010.
  7. ^ "Lightning 1.0 Beta 2 and Compatibility". June 17, 2010. Archived from the original on June 19, 2010. Retrieved June 22, 2010.
  8. ^ "Lightning :: Add-ons for Thunderbird". July 29, 2011. Retrieved August 3, 2011.
  9. ^ "Calendar Weblog". Archived from the original on 2010-02-12. Retrieved 2007-10-09.
  10. ^ Interview On Mozilla Lightning and

External links[edit]