Despite the fact that incredible work is being done on Microsoft Dynamics CRM 2015 and there are users using Dynamics CRM 2013, there are also users who are working with Microsoft Dynamics CRM 2011.
Microsoft Dynamics CRM 2011 had a rollup released, did you miss it?
Microsoft Dynamics CRM v2011 Roll Up 18 http://support2.microsoft.com/kb/2958724