Mainstream Support for SQL Server 2008 and SQL Server 2008 R2 was ended on July 8th 2014. This will result no enchantment or no future release of SPs. Somehow, Critical bug fixes may be release as QFE etc.
This sequence stop with SQL Server 2008 Service Pack 3 CU16 and SQL Server 2008 R2 Service Pack 2 CU13.
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Reference : Rohit Garg (http://mssqlfun.com/)