Update Rollup 3 for Exchange 2010 Service Pack 2 released
Exchange team blog post: https://blogs.technet.com/b/exchange/archive/2012/05/29/released-update-rollup-3-for-exchange-2010-service-pack-2.aspx
download from here: https://www.microsoft.com/en-us/download/details.aspx?id=29899