Survey says: Microsoft's patent might worries few, angers many more
If I were a large enterprise or ISV or service provider or telco I would take Microsoft's implied threats seriously. And I would seek direct, specific relief ... in writing. It could be quite simple, something like, "As I buy these products from Microsoft, it then promises not to sue me for the use of GPL v 1, v 2, or v3 licensed code and goods forever."