Question about Windows 7 Test Mode?

I am running a legit copy of Windows 7 through Boot Camp obtained through the MSDNAA between Windows and my University (University of Michigan). It is registered with a product key and it says it is activated in my control panel. In the bottom right corner of the desktop it says “Test Mode, Windows 7, Build 7600”. Does anyone know why this is. In the quotes each of the phrases between the comma is on a different line.