Is a company obligated to sell a product with features that you consider useful? Intel doesn't make pre-ME CPUs anymore. Apple doesn't make Power PC iMacs anymore. And Microsoft doesn't make Windows XP anymore. In all these markets, there are consumers who would prefer to purchase the discontinued product. So what? Products get discontinued.

Consider a discontinued product from another industry, like a car or an appliance. When the product is discontinued, the manufacturer only creates replacement parts for existing machines for a limited time period. After some years, it's difficult for a consumer to maintain their copy of the discontinued product because it is difficult to find replacement parts.

The point is, mass produced engineering products have lifecycles. Microsoft clearly defined (and extended) Windows XPs lifecycle and provided patches for the entirety of that lifecycle. It's hard for me to understand how that doesn't fully meet their obligations to be fair to their customers.