CMake express the "greater or equal" statement

I know that in CMake I can check for the compiler version like this

if(MSVC_VERSION LESS 1700)... // MSVC is lower than MSVC2012

but how do I express this in CMake syntax?

if(MSVC_VERSION GREATER_OR_EQUAL_TO 1700)... // MSVC greater or equal to MSVC2012