Microsoft has already officially confirmed the event on September 30 to show off an enterprise technology preview of its next version of Windows, codenamed Threshold. We have already seen leaked images and videos of the all new Windows 9 Start Menu, here are two new videos showing the new Notification center and the virtual-desktop functionality.

While everybody is eagerly waiting for official release of Microsoft Windows 9 Technical Preview, a newly leaked video is now gaining views as it demonstrates the "all-new" marriage between "Start Button" and "Metro UI". This seems a perfect solution for users who hated the extreme move by Microsoft to prioritize Metro UI over Start Button but at the same time keep the Metro UI alive and useful. The video gives Windows’ users a first look at the new Start menu in action, it clearly shows three brand new features in Windows 9 - the notification center, Windowed Metro apps and Virtual desktops.

After some convincing internal builds leaks of Windows 9, we are now hearing rumors that Microsoft is working feverishly towards a release of "Windows Threshold Technical Preview" next month following the earlier announced rapid-release cycle schedule for Windows OS. The newest feature to make it's way into current builds of "Windows 9" would be the ability to upgrade "Windows builds" with a single-click without requiring a complete re-installation of the OS as needed with older Windows OS's.