http://blogs.technet.com/b/rischwen/archive/2013/02/13/exchange-2010-sp3-sp2-ru6-and-exchange-2007-sp3-ru10-released.aspxThe much anticipated Exchange 2010 SP3 has been released along with SP2 RU6 and 2007 SP3 RU10. There are links below to the actual KB articles below. Note the excerpt below about coexistence between Exchange 2010 SP2 and Exchange 2013. NOTE : Exchangeen-USTelligent Evolution Platform Developer Build (Build: 5.6.50428.7875)