In stable builds of Windows 10 like 10240 (Windows RTM) and 10586 (November Update), when you click the clock in the notification area/tray area of the taskbar which is usually in the bottom right corner, a new Calendar and Date-Time pane will appear on the screen. This change was made by Microsoft to adapt the old calendar function to new devices with touch screens. If you are not happy to use it and would like to revert it to the Windows-7 like calendar popup, you will be happy to know that it is still possible. Here is how to change it back.
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