|I stopped writing Windows Phone Apps when they made it so that everything had to be ".Not" ... I'm far too busy to find the time to expand my C# knowledge (which is minimal).
All of the app I wrote were C++ native code for the devices.
I still have a few old Windows Mobile devices that have several applications on them that I use for testing my ActiveSync Service, backup applications, programmers utilities, etc... And yes, the phones still work (for Testing over Wi-Fi), though these days, those old batteries are getting tired!
Looking into HTML5 somewhat... but never enough time.