If your an application user and you upgrade to a new operating VR, then you 
have to test. If you apply PTFs to an already existing VR, you have to test.

If your a developer and want to upgrade to a new VR you have to be aware of 
what your customer VR spread is. If you are crazy, you will tell your old VR 
customers that you won't support them anymore. If your not in that state of 
you will come up with a scheme that will allow you to support multiple 
versions of your application.

My question: why all the waste words about retrofitting previous VRs with new 
features? It just wasted time. 

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