I have seen a couple of these posts regarding Windows 8 and compatibility. I do not have the answer either but have a Windows 8 laptop (complete with USB 3 ports) on the way and will test the 450C and 460EX cameras for compatibility with Windows 7 drivers and USB 3 ports when I get the chance. I will post the results on this forum when I have them. I am really surprised that no one from Atik has chimed in on the compatibility question yet. Even if the drivers do not work, there is always ASCOM.
-Pat Holland