"Asked by Fast Company whether Apple might fall into the same problems as Microsoft by trying to be all things to all people with its operating system, the Apple CEO mused: "I think it's different. Part of the reason Microsoft ran into an issue was that they didn't want to walk away from legacy stuff."
It's an interesting word, "legacy." Some people think of it as a thing to leave behind after you're dead, so that others think of you fondly.
In this case, Cook was suggesting that Microsoft had a certain stick-in-the-mud obstinacy about the things the company created."