Are you surprised at MS's drop?

I'd imagine most of the sales of late relate to 6.5; Windows Phone 7 has been of very limited appeal because it is effectively crippled in so many areas, lacks the apps and services required to gain traction and has been offered on some pretty uninspiring hardware.

Much will change with Mango (although not enough for me, I fear) and with Nokia contributing Maps to all WP devices and offering quality hardware alternatives, I'd expect that curve to turn around by this time next year.