Mainstream support for Microsoft Dynamics 4 expires in April 2013. After this date Microsoft will no longer provide free updates and non-security fixes for Microsoft CRM 4.

Extended support will be available until April 2018. Extended support provides similar features to Mainstream Support but requires paid support cases to be opened with Microsoft. Here you can find more information on extended support.

Recently; Microsoft published Rollup 21 for Microsoft Dynamics CRM 4 – this is widely believed to be one of the last updates for Microsoft Dynamics CRM 4.

Table of Microsoft Dynamics CRM Support End Dates

Products Released	Lifecycle Start Date	Mainstream Support End Date	Extended Support End Date
CRM 1	01/01/2003	11/07/2006	N/A
CRM 1.2	31/10/2003	09/01/2007	N/A
Dynamics CRM 3	01/12/2005	12/04/2011	12/04/2016
Dynamics CRM 4	29/02/2008	09/04/2013	10/04/2018
Dynamics CRM 2011	18/05/2011	12/07/2016	13/07/2021