The issue focused on security was whether they could install Windows 10 on any existing machines that did not come with it. At that point, Windows 10 was still just an experimental operating system and could not be installed on consumer computers. However, Microsoft didn't actually install Windows 10 on consumer computers (they didn't even release it for consumers), so they didn't really make any argument about whether they could install Windows 10 on consumer computers. What they did do was release an upgrade (Windows 10 Home) for consumer computers that