If you're a sysadmin in charge of Windows 7 computers, get ready for a ton of "this copy of Windows is not genuine" messages.
Microsoft changed how their activation server responds to queries, and now a bunch of machines are starting to fail to verify their keys.
The issues seems to be that with KMS activated computers, machines are suppose to talk to your onsite KMS server to validate the license. However, KB971033 added an additional check in order to prevent piracy. With KB971033 installed, computers also check against Microsoft's servers. It seems like Microsoft changed how their server responds to these queries yesterday, and as a result activation now fails.
Uninstalling KB971033 and reactivating Windows against your KMS seems to fix the issue. Instructions for doing so can be found in this Spiceworks thread.
https://community.spiceworks.com/topic/2185234-kms-clients-windows-is-not-genuine
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school has had a load of windows 10 PCs do this too
not sure if its the exact same thing but pretty much all the first years laptops are complaining that they dont have a genuine key
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wonder if it's related to all my 10 computers doing just that on January 1st midnight? Rerunning activation fixed it. Also happened to a couple of VMs I had on autokms.
not sure if its the exact same thing but pretty much all the first years laptops are complaining that they dont have a genuine key 
