Well Uber also has a nice market cap. Only on HN is market cap more important than silly things like profit.
But MS recent success has nothing to do with maintaining backwards compatibility. They had to purposefully move away from emphasizing Windows to be successful and move to the cloud, Office on other platforms, abandoning IE, give up the idea of ever selling Windows to end users when it isn’t bundled with the computer, building IE on top of Chrome, and by announcing an Android device.
Does that seem like Windows was a winning strategy?