Basically it's an indicator towards the end of monolithic Windows and Office desktops. |
Every government has its own rules for antitrust that are in many ways very different from each other. It is more of a frustration for developers than anything else. |
If the ruling is upheld, Microsoft would have to withdraw its current version of Windows from South Korea. There would no longer be a single consistent version of Windows globally. Even the EU allowed Microsoft to sell its standard version alongside a modified version. |