Hardware 2.0 reports that Windows Phone 7 handsets feature a jailbreak-rollback feature that reverts the OS back to a locked state

It seems that jailbreaking Windows Phone 7 handsets isn’t as straightforward as once thought, as the handsets feature a jailbreak-rollback feature that reverts the OS back to a locked state.

  Windows Phone 7 handsets incorporate jailbreak-rollback feature