How to know if I am running SQL Server 2008 R2?
If you were running SQL Server 2008 R2 it would have 10.5.xxx instead of 10.0.xxx.  And it would also say Microsoft SQL Server 2008 R2 ....

You can always find out the named version by the major/minor build number:


10.5 : 2008 R2
10 : 2008
9 : 2005
8 : 2000
...so on and so forth