Microsoft has released Update Rollup 3 for Microsoft Dynamics CRM Server 2011. It includes updates and hot fixes packaged together for easy deployment. We recommend that you install the update rollup to keep your software performing at its best.
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http://blogs.msdn.com/b/crminthefield/archive/2011/07/15/podcast-and-overview-microsoft-dynamics-crm-2011-update-rollup-3.aspx