Time files and we are now at the end of Exchange 2010 SP2, Windows XP and Office 2003 extended support. It seems like only yesterday when Exchange 2010 SP2 was released in November 2011,
The support lifecycle marker is the Exchange 2010 Service Pack. Exchange 2010 Rollup Updates (RU), are not milestones in the support lifecycle. So regardless if you have Exchange 2010 SP2 RU 8 stalled, that build of Exchange 2010 will no longer receive security updates and code updates. To receive the support you are entitled to please ensure that all your Exchange 2010 servers have SP3 installed. Ideally they will have a recent RU installed as well. At the time of writing this should be Exchange 2010 SP3 RU4 or RU5 since there is a security issue resolved in Exchange 2010 SP3 RU4.
Read more at source: http://blogs.technet.com/b/rmilne/archive/2014/04/09/end-of-exchange-2010-sp2-support.aspx