Update Rollup 5 for Exchange 2010 SP1 have been released. For feedback and comments have a look at the team blog here: http://blogs.technet.com/b/exchange/archive/2011/08/23/released-update-rollup-5-for-exchange-2010-sp1.aspx For downloading the UR5 Exchange 2010 SP1 directly, go to: http://www.microsoft.com/download/en/details.aspx?displaylang=en&id=27193 KB for what issues have been fixed in the update rollup http://support.microsoft.com/?kbid=2582113 Before deploying it into production, make sure you have tested it in a test environment.