I’m sure it will do at least as well as the “iPod killer” Zune did.
Zune was a good device with a huge flaw...they tried to give a closed market like Apple did. I couldn’t believe they’d be that stupid but they were. An open market for the Zune would have helped them a lot.
But the Windows Phone is getting rave reviews and even apple fans are raving about Windows Phone UI. Plus windows 8 is set to harmonize phone, tablet/pad, and PC.