Where to download - http://www.microsoft.com/en-us/download/details.aspx?id=29697
List of Issues and Features:
Good Instructions - http://blogs.technet.com/b/kevinholman/archive/2012/05/08/opsmgr-2012-cumulative-update-release-1-ur1-ships-and-my-experience-installing-it.aspx
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