_MSC_VER 	Reports the major and minor versions of the compiler. 

For example, 1310 for Microsoft Visual C++ .NET 2003. 1310 represents version 13 and a 1.0 point release. 
The Visual C++ 2005 compiler version is 1400.
In Visual Studio 2008, _MSC_VER is defined as 1500.
The Visual Studio 2010, _MSC_VER is defined as 1600.