That's a vendor doing their own integration on PoketPC.
Microsoft didn't offer RIL for radio stack integration until 2002:
http://en.wikipedia.org/wiki/Windows_Mobile
All of this is pedantic. MS phones came with A STYLUS, until 2006! They made shit phone software for 4 years, with no market success and had to be SCHOOLED by Apple.
The Zune 2nd Gen would have been a beautiful "catch-up" point for MS. They could have used their finally elegant iPod knock-off to build the iPhone knock-off. But they screwed that pooch in the kennel. The Zune IP was ditched and users abandoned, in the mindless pursuit to keep "Windows" relevant, and build anew for the tablet "strategy" they'd also gotten TOTALLY WRONG since 2004.
After spending over 12 Billion on R&D labs between 1999-2010, you think they'd come up with something other than wannabe OS's, devices and me-too cloud services.