How to activate notifications center in Windows 10 Technical Preview
Windows 10 Technical Preview does not include the notification center, but if you are ready to perform some instructions, you can enable this feature right now. However, keep in mind that with this method, the notification center will not be on all the time. In addition, in the system tray no icon is added to the notification center.
Instructions are simple enough. Download the ZIP-archive. Remove the folder x86 or x64 depending on the version of operating system installed, and rename it to «stuff».
Now just run the file notification.exe to see the notification center. Initially it will be empty, but if you, for example, install the app from the Windows Store, it will be displayed in it.