After being upgraded to Windows 10 Anniversary Edition, I was greeted with this screen when I started Skype
As you can see, there is no "No, thanks" button. Clicking on the cross simply minimizes the window, the menus contain nothing useful (apart from Skype->close, which again minimizes the window), and none of the words on the screen seem clickable apart from the big blue button. How does one continue to use Skype without joining the preview? This window replaces the Skype main window, so it is impossible to use Skype normally while it is open. This whole situation seems a bit Kafkaesque.