Before this, we don't know more about how this start button works. Although some sources have emphasized that the Windows 8.1 start button is not the same as the current one on Windows 7 (that is, the familiar start-up menu opens directly after the click).
Now, after spending a little time, Mary Jo Foley finally collected the details of the Windows Blue start button from an important source. It is said that the new start button looks the same as the start button in the current Windows 8 Charm sidebar: it looks like a slanted, flat window. It is most likely used by default, but you can cancel if you don't want it.
The new Start button will be located in the Windows 8.1 desktop mode taskbar, and the location should be at the far left, the same as the "old" button in Windows 7 (as shown at the end of the picture).
According to the source, the start button is invisible when the user is on the start screen or in a Metro style/Windows Store app. If /when the user moves the mouse to the lower left corner, it will appear in front of you. In the current Windows 8 system, the user moves the mouse to the lower left corner to see a thumbnail of the start screen, which will be replaced by the start button in the new system.
In addition, there is an option to see the "All Apps" view directly after clicking the Start button instead of the active tile view of the start screen. This "All Apps" view is the same as what we currently see in Windows 8 (right click on the Windows 8 start screen to bring up the app taskbar and select “All apps”). In Windows Blue —— as previously revealed in several early development releases, —— users swipe up the Start screen by clicking "All Apps".
However, according to sources, Microsoft plans to allow users to click the new Start button to display the "All Apps" view by default. If you don't want to enter the active tile interface of the start screen, you can set it up. That is to say, after the user selects a new start button, the system will pop up a “Start Screen” that lists all the icons of the application, and there is no active tile that has been rolled over. Users can arrange these icons based on the usage of the app, leaving some commonly used apps ahead. Such a view should be closer to the Windows 7 start menu, but here is a full screen display, not a list.
Sources It has been confirmed that booting directly into desktop mode has also been added to the Windows Blue Milestone Preview version. It works just like what you hear: users can choose to go directly to the traditional desktop mode without first entering the Metro style start screen and then going to desktop mode. But even if the user enters the desktop mode from the beginning, they will enter the Metro style start screen when they click the Start button.
In addition, Windows Blue may have a very interesting UI adjustment. Microsoft is expected to allow users to use the same background in both the Metro style start screen and the traditional desktop mode. This may be done to reduce the user's inability to switch between the two environments. The breaking news of Paul Thurrott has also released a screenshot of this feature, you can look at the two pictures below, it has appeared in the recent Blue preview.
Mary Jo Foley wants Microsoft to comment on this information, but Microsoft doesn't want to comment. Microsoft officially said they plan to launch a public preview of Windows Blue on the first day of the Microsoft Build 2013 Developer Conference on June 26.