Source: Microsoft [TechNet]
quote: This is really showing that you have never used a Windows Phone. You can choose a tile to act as a notifier for WHATEVER you want. I have my SMS, and two email accounts set up as live tiles. I can glance at the screen to see if I have any messages and if I do I can read them with two taps.
quote: As these contracts expire and more Windows Phone options become available, it is likely that more people will gravitate toward it because it is such a well-designed mobile OS.