Bill Gates is reportedly furious as the world’s largest PC manufacturer, Lenovo, makes a historic break from Windows, replacing it with Linux as the default operating system on millions of laptops. This move shatters a 30-year industry norm, turning Windows from the automatic standard into a paid upgrade for the first time in modern PC history. And the most shocking part: Lenovo is doing this because Linux makes more money, creates fewer problems, and exposes just how costly Windows has become for the companies that build the world’s computers.