virtualbox.org

Hi All:
i am using VBOX 4.1.18 , i install several windows server 2012 vm and wanting to test the new features, but i was unable to install hyper v role (which enables vm within vm), its telling me my processor doesnt have that feature, i had not issue creating vm within ESXi 5 VM

has anybody tried that ?

thanks

Of course not. Hyper-v is a physical host feature, not a feature of the VM. In any case you can't run one VM platform inside another.