SQL Server 2008 R2 (major build version 10.50.xxxx). Please also tag with sql-server.
SQL Server 2008 R2 was introduced in April 2010. Current build versions include:
- 10.50.1600 RTM
- 10.50.2500 Service Pack 1, released July 2011
- 10.50.4000 Service Pack 2, released July 2012
- 10.50.6000 Service Pack 3, released September 2014 (final)
SQL Server 2008 R2 left mainstream support on 2014-07-08, and will leave extended support on 2019-07-09.