Back to anecdotal evidence? On the other hand, considering all the people I know who've owned smartphones over the years, I know MANY, MANY people, who don't currently own a Windows Mobile phone but used to--and will never go back to one because of the bad taste it left in their mouth on various levels (the OS was awful, the devices were far too expensive compared to competitors, the number of apps were ALWAYS far fewer than most other platforms... even in the days when Windows was performing better, it was never a particularly good experience to own a Windows Mobile phone and watch other people over the years being happier and doing more with their Treos or iPhones and so on).

I think that, despite the fact that Windows Phone 7 is based on all-new code, it's still having to contend with its Windows Mobile legacy that extends far out beyond just the code base.