The 13th Cumulative Update release for SQL Server 2008 R2 SP1 is now available for download at the Microsoft Support site. Cumulative Update 13 contains all the SQL Server 2008 R2 SP1 hotfixes which have been available since the initial release of SQL Server 2008 R2 SP1.
To learn more about the release or servicing model, please visit:
Previous Cumulative Update KB Articles:
CU#1 KB Article: http://support.microsoft.com/kb/2544793