Obviously, Microsoft gave some of their products common-noun type names like "Word", "Excel", and "Office" in the hopes to generate free PR by people thinking of Microsoft products any time we used those words in our common discourse. But can you imagine how ridiculous it'd be if Microsoft said nobody else can lay claim to those words? That's what the argument between Ford and Tesla about "Model e" sounds to me.
Once again no one else can use those words for software productivity suite. Just like no one else can use Model E for a car. Just like Ford can trademark Mustang. And like Tesla probably has trademarked Model S—but not sure on that.