Windows 8.1 Released to manufacturing August 27, 2013 and available in October 17, 2013 which was a bit different from the previous Windows 8. The main function of windows 8.1 was still same as of the previous version. The historic Windows OSs’ are can be almost same in the matter of start button, but Windows 8 change the classical pattern of start button to the portable gauged like menu. But again the classical test can be tested in Windows 10
From left to right Windows 8, Windows 8.1 and Windows 10
Windows 10 is now out for the final relies the availability will be from the late of 2015 in markets and store.
User interface and desktop Virtual desktop in Windows 10 with Network window opened in selected desktop. The user interface of Windows 10 is designed primarily to optimize its experience based on the type of device and available inputs, providing "the right experience on the right device at the right time." For non-touch devices, a variation of the previous Start menu is used as part of the desktop interface, featuring both a traditional listing of applications and search box on the left side, along with Windows 8-style live tiles on the right. Also, some of the icons such as the file explorer icon have been given newer flat icons, to match with the Metro UI. Microsoft will probably change all the icons to match each other. A new virtual desktop system known as "Task View" was also added; similarly to OS X's Exposé function, clicking the Task View button on the taskbar or swiping from the left of the screen displays all the windows currently open on a desktop, allowing users to switch between them, snap them to the side of the screen, or switch between multiple workspaces. Currently, there is no animation when toggling the virtual desktop changer, but Microsoft may add an animation for this action. Windows Store apps, which previously could only be used in a full-screen environment, can now be used within windows on desktops. When used in this manner, an "App Commands" menu on the title bar of the window is used to activate functions previously seen on the charms.
Here the download link of the Windows 10 RTM version:
