Per, the following link, the end of mainstream maintenance and support for the 3.1 and 4.0 platforms is 12/31/2015. 4.1 will have mainstream maintenance through 12/31/2018.
For those of you responsible for system administration, it would be a good idea to review your project plans for updating/upgrading your existing environments if you haven't done so already. Many smaller companies are unaware of the maintenance dates. Just in the last few weeks, I've upgraded customers from Crystal Enterprise 10 and Crystal Reports Server XI to SAP Crystal Server 2013 (14.1).