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This page aims to give an overview of what version of Lightning is compatible with what version of Thunderbird. It also shows which Mozilla Platform Version is used in the respective version of Sunbird and Lightning.

The main goal of the Calendar Team is to synchronize the Lightning release cycle with Thunderbird. This usually means we will be using the latest Thunderbird and Mozilla codebase (comm-central and mozilla-central) for active development. If the Thunderbird schedule isn't yet clear, we will backport our changes to an older branch.

Lightning

Development Snapshots

The Lightning builds listed below should be considered unstable and are available for development and testing purpose only.

Lightning
Version		 Thunderbird
Version		 SeaMonkey
Version		 Mozilla Platform
Version		 Build Name
and Date		 Changelog Comments
5.4a1 52.0a1
"Daily"		 2.49a1 mozilla52 "nightly"
(comm-central)
every day		 changes in 5.4  
5.3a2 51.0a2
"Earlybird"		 2.48a2 mozilla51 "alpha"
(comm-aurora)
every day		 changes in 5.3  
5.2b1* 50.0b1
"Beta"		 2.47b1 mozilla50

"beta"
(comm-beta)
not yet released

 changes in 5.2 * Visit the link and go down to the "Development Channel" box and download the Lightning version from there. Previous beta builds are listed at Lightning Version History.

Stable Releases

The Lightning releases listed below are considered stable and are recommend for daily usage.

Lightning
Version		 Thunderbird
Version		 SeaMonkey
Version		 Mozilla Platform
Version		 Release Date Changelog
5.2b1 (Beta) 50.0 (Beta) 2.47 mozilla50 October 9, 2016 changes in 5.2
5.1b1 (Beta) 49.0 (Beta) 2.46 mozilla49 October 16, 2016 changes in 5.1
5.0b1 (Beta) 48.0 (Beta) 2.45 mozilla48 October 16, 2016 changes in 5.0
4.9b2 (Beta) 47.0 (Beta) 2.44 mozilla47 July 1, 2016 changes in 4.9
4.8b1 (Beta) 46.0 (Beta) 2.43 mozilla46 --- changes in 4.8
4.7.4 45.4.0 --- mozilla45 October 3, 2016 changes in 4.7.4
4.7.3 45.3.0 --- mozilla45 August 30, 2016 changes in 4.7.3
4.7.2 45.2.0 --- mozilla45 June 30, 2016 changes in 4.7.2
4.7.1.1 45.1.1 --- mozilla45 May 31, 2016 changes in 4.7.1.1
4.7 45.0 2.42 mozilla45 April 25, 2016 changes in 4.7
4.6b1 (Beta) 44.0 (Beta) 2.41 mozilla44 January 21, 2016 changes in 4.6
4.5b1 (Beta) 43.0 (Beta) 2.40 mozilla43 January 8, 2016 changes in 4.5
4.4b2 (Beta) 42.0 (Beta) 2.39 mozilla42 October 14, 2015 changes in 4.4
4.3b2 (Beta) 41.0 (Beta) 2.38 mozilla41 September 16, 2015 changes in 4.3
4.2b1 (Beta) 40.0 (Beta) 2.37 mozilla40 July 30, 2015 changes in 4.2
4.1b1 (Beta) 39.0 (Beta) 2.36 mozilla39 --- changes in 4.1
4.0.7.2 38.7.2 --- mozilla38 April 4, 2016 ---
4.0.6 38.6.0 --- mozilla38 February 16, 2016 changes in 4.0.6
4.0.5.2 38.5.1 2.35 mozilla38 January 21, 2016 changes in 4.0.5
4.0.4.1 38.4.0 2.35 mozilla38 November 30, 2015 changes in 4.0.4
4.0.3.1 38.3.0 2.35 mozilla38 October 8, 2015 changes in 4.0.3
4.0.2.1 38.2.0 2.35 mozilla38 September 16, 2015 changes in 4.0.2.1
4.0.2 38.2.0 2.35 mozilla38 August 14, 2015 changes in 4.0.2
4.0.1.2 38.1.0 2.35 mozilla38 July 23, 2015 changes in 4.0.1.2
4.0.1 38.1.0 2.35 mozilla38 July 8, 2015 changes in 4.0.1
4.0.0.1 38.0.1 2.35 mozilla38 June 12, 2015 changes in 4.0.0.1
3.9b1 (Beta) 37.0 (Beta) 2.34 mozilla37 March 14, 2015 changes in 3.9
3.8b2 (Beta) 36.0 (Beta) 2.33 mozilla36 March 12, 2015 changes in 3.8
3.7b1 (en-US only) --- 2.32 mozilla35 January 28, 2015 changes in 3.7
3.6b3 (Beta) 34.0 (Beta) 2.31 mozilla34 December 17, 2014 changes in 3.6
3.5b1 (Beta) 33.0 (Beta) 2.30 mozilla33 September 23, 2014 changes in 3.5
3.4b1 (Beta) 32.0 (Beta) 2.29 mozilla32 August 18, 2014 changes in 3.4
3.3.3 31.0 2.28 mozilla31 January 28, 2015 changes in 3.3.3
3.3.2 31.0 2.28 mozilla31 December 27, 2014 changes in 3.3.2
3.3.1 31.0 2.28 mozilla31 September 23, 2014 changes in 3.3.1
3.3 31.0 2.28 mozilla31 July 21, 2014 changes in 3.3
3.2b1 30.0 (Beta) 2.27 mozilla30 May 9, 2014 changes in 3.2
3.1b1 29.0 (Beta) 2.26 mozilla29 April 24, 2014 changes in 3.1
3.0b1 28.0 (Beta) 2.25 mozilla28 March 6, 2014 changes in 3.0
2.9b1 27.0 (Beta) 2.24 mozilla27 December 19, 2013 changes in 2.9
2.8b1 26.0 (Beta) 2.23 mozilla26 November 15, 2013 changes in 2.8
2.7b1 25.0 (Beta) 2.22 mozilla25 October 17, 2013 changes in 2.7
2.6.6 24.5.0 --- mozilla24.5 June 19, 2014 changes in 2.6.6
2.6.5 24.5.0 --- mozilla24.5 May 13, 2014 changes in 2.6.5
2.6.4 24.2.0 --- mozilla24.2 December 11, 2013 changes in 2.6.4
2.6.3 24.1.1 --- mozilla24.1.1 November 19, 2013 changes in 2.6.3
2.6.2 24.1.0 --- mozilla24.1 October 29, 2013 ---
2.6.1 24.0.1 --- mozilla24.0.1 October 13, 2013 changes in 2.6.1
2.6 24.0 2.21 mozilla24 September 11, 2013 changes in 2.6
2.5b2 --- 2.20 mozilla23 July 8, 2013 changes in 2.5
2.4b1 --- 2.19 mozilla22 May 24, 2013 changes in 2.4
2.3b2 --- 2.18 mozilla21 May 8, 2013 changes in 2.3
2.2b1 --- 2.17 mozilla20 March 6, 2013 changes in 2.2
2.1b1 --- 2.16 mozilla19 February 12, 2013 changes in 2.1
2.0b1 --- 2.15 mozilla18 November 29, 2012 changes in 2.0
1.9.1 17.0 2.14 mozilla17 March 6, 2013 changes in 1.9.1
1.9 17.0 2.14 mozilla17 November 20, 2012 changes in 1.9
1.8 16.0 2.13 mozilla16 October 09, 2012 changes in 1.8
1.7 15.0 2.12 mozilla15 August 28, 2012 changes in 1.7
1.6 14.0 2.11 mozilla14 July 17, 2012 changes in 1.6
1.5.2 13.0 2.10 mozilla13 June 21, 2012 ---
1.5.1 13.0 2.10 mozilla13 June 14, 2012 ---
1.5 13.0 2.10 mozilla13 June 4, 2012 changes in 1.5
1.4 12.0 2.9 mozilla12 April 23, 2012 changes in 1.4
1.3 11.0 2.8 mozilla11 March 13, 2012 changes in 1.3
1.2.3 10.0 2.7 mozilla10 March 9, 2012 ---
1.2.1 10.0 2.7 mozilla10 February 3, 2012 ---
1.2 10.0 2.7 mozilla10 January 23, 2012 changes in 1.2
1.1.1 9.0 2.6 mozilla9 January 5, 2012 changes in 1.1
1.0 8.0 2.5 mozilla8 November 7, 2011  
1.0b7 7.0 2.4 mozilla7 September 27, 2011  
1.0b5 6.0 2.3 mozilla6 July 29, 2011  
1.0b4 5.0 2.2 mozilla5 June 28, 2011  
1.0b2 3.1.* --- mozilla-1.9.2 June 24, 2010  
1.0b1 3.0.* 2.0 mozilla-1.9.1 January 12, 2010  
0.9 2.0.0.* --- mozilla-1.8.1 September 23, 2008  
0.8 2.0.0.* --- mozilla-1.8.1 April 4, 2008  

Stable ESR Releases

Thunderbird 10 and 17 were considered Extended Support Releases (ESR), which Lightning is compatible with. We followed the ESR policy of Thunderbird and only did releases for security fixes. Additionally, some fixes may have been backported for important regressions related to enterprise features like invitations.

Lightning
Version		 Thunderbird
Version		 SeaMonkey
Version		 Mozilla Platform
Version		 Release Date
1.9.1 17.0esr 2.14 mozilla17 March 6, 2013
1.2.3 10.0esr 2.7 mozilla10 March 9, 2012

Sunbird

Please note that Sunbird has been discontinued, see this blog post for details. There will be no further Sunbird release until further notice.

Sunbird
Version		 Mozilla Platform
Version		 Release Date
1.0b1 1.9.1 March 30, 2010
0.9 1.8.1 September 23, 2008
0.8 1.8.1 April 4, 2008

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 Contributors to this page: mschroeder, Ssitter, kewisch, fscholz, XFallenAngel, Sheppy, Tony_Mechelynck, phil.davis, PeterLairo, Standard8, jhatlak
 Last updated by: mschroeder,