I'm not sure that you can deactivate a Microsoft product. When you activate you use one activation, and each key has a number of activations. When you reach the activation limit the key is used up.
MSND retail keys has 10 online activations, then at least 15 phone activations. After that you has to be lucky if you can do any more activations on that key. Other keys, like Windows Server keys is MAK keys, and has a specific numbers of activations, normally 500. When you have activated 500 times, you have to buy a new key (sub).
So deactivating MSDN keys will not work, since they only register activations, and not how many computers that actually use that key.
Kenneth Myhre
