The table below outlines the current release and availability of all versions of Corticon:

Active (launch)Matures(1)
Retires
Corticon 5.7 SP2 (5.7.2) 1 Oct 2018 - 13 Feb 2022 (2)
Corticon 5.7 SP1 (5.7.1) 9 Jul 2018 - 1 Oct 2018
Corticon 5.7 13 Feb 2018 - 9 Jul 2018
Corticon 5.6 SP1 (5.6.1) 7 Apr 2017 13 Feb 2018 1 Jan 2021
Corticon 5.6 28 Oct 2016 7 Apr 2017
Corticon 5.5 SP2 (5.5.2) 28 Jan 2016 - 8 Jun 2019
Corticon 5.5 SP1 (5.5.1) 30 Sep 2015 - 28 Jan 2016
Corticon 5.5 8 Jun 2015 - 30 Sep 2015
Corticon 5.4 SP1 (5.4.1) 31 Oct 2014 8 June 2015 11 Aug 2018
Corticon 5.4 11 Aug 2014 - 31 Oct 2014
Corticon 5.3 SP4 (5.3.4) 11 Mar 2014 11 Aug 2014 11 Mar 2017
Corticon 5.3 SP3 (5.3.3) 24 Oct 2013 - 11 Mar 2014
Corticon 5.3 SP2 (5.3.2) 13 July 2013 - 24 Oct 2013
Corticon 5.3 SP1 (5.3.1) 20 May 2013 - 13 July 2013
Corticon 5.3 18 Sep 2012 - 20 May 2013
Corticon 5.2 1 Feb 2012 18 Sep 2012 1 Feb 2016
Corticon 5.1 SR1 (5.1.1) 6 May 2011 1 Feb 2012 18 Feb 2015
Corticon 5.1 18 Feb 2011 - 6 May 2011
Corticon 4.3 SR2 (4.3.2) 29 Jul 2011 18 Feb 2011 29 Jul 2014
Corticon 4.3 SR1 (4.3.1) 12 Apr 2011 - 29 Jul 2011
Corticon 4.3 13 Oct 2010 - 12 Apr 2011
Corticon 4.2 20 Oct 2009 13 Oct 2010 20 Oct 2013
Corticon 4.1 SR2 (4.1.2) 11 Aug 2008 20 Oct 2009 11 Aug 2011
Corticon 4.1 SR1 (4.1.1) 27 Sep 2007 - 11 Aug 2008
Corticon 4.1 16 May 2007 - 27 Sep 2007

(1) The Active release becomes Mature when it is superseded by a new Major or Minor version of the product. Customers are encouraged to move to the current Active release in a timely manner in order to obtain the maximum level of support available.

(2) Corticon 5.7.2 will retire no earlier than "13 Feb 2022", excluding release of a Corticon 5.7.3. If a Corticon 5.7.3 release occurs, it would immediately move Corticon 5.7.2 to retired.  

What do the phases mean?

ActiveMaturesRetired
Technical support Yes Yes Yes(1)
Hot fixes Yes Yes
Service packs Yes

(1) Best attempt support, i.e. the product cannot be fully supported, but Technical Support aim to provide help where possible.