Re: If they were looking for customers to move to Azure...
It doesn't look MS asked more to support EOLed systems, it looks they just told them they no longer qualify for discounted licenses so they have to pay as a for-profit company.
It's probable CERN is not one of the biggest Windows shop as for many reasons a lot of stuff is running on non-MS OSes, but it looks a dumb move anyway.
MS still looks unable to understand that once he loses the dominance on desktop systems, Azure becomes far less appealing - no matter how Linux it runs there. And this moves about licenses don't make you more willingly to sign a contract with them - whatever your software will run.