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    Calendar Versions

    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
    4.3a1 41.0a1
    "Daily"
    2.38a1 mozilla41 "nightly"
    (comm-central)
    every day
    changes in 4.3  
    4.2a2 40.0a2
    "Earlybird"
    2.37a2 mozilla40 "alpha"
    (comm-aurora)
    every day
    changes in 4.2  
    4.1b1* 39.0b1
    "Beta"
    2.36b1 mozilla39

    "beta"
    (comm-beta)
    not yet released

    changes in 4.1 * 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
    4.0b3 38.0 (Beta) 2.35 mozilla38 April 28, 2015 changes in 4.0
    3.9b1 37.0 (Beta) 2.34 mozilla37 March 14, 2015 changes in 3.9
    3.8b2 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 34.0 (Beta) 2.31 mozilla34 December 17, 2014 changes in 3.6
    3.5b1 33.0 (Beta) 2.30 mozilla33 September 23, 2014 changes in 3.5
    3.4b1 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

    Lightning is compatible to the Thunderbird Extended Support Release (ESR) releases. We follow the ESR policy of Thunderbird and only do releases for security fixes. Additionally, there may be backported fixes 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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    Last updated by: Ssitter,