The new mobile OS is on sale in Europe for some time now and untill now the feedback seems to be good, but I can't find any hard numbers.
Here is all I found: http://www.digitimes.com/news/a20101028PD206.html (HTC HD2 sold beyond expectation, HTC unprepared for "massively strong demand")
And one German news:
http://www.n-tv.de/technik/HTC-HD7-bei-O2-ausverkauft-article1817471.html (in German - Windows phone 7 off to a good start HTC HD7 sold out at O2 is the title, some notable things: HTC HD7 at least sold at the higher end of the 5 digit-area (about 80000 phones), German Telekom reports strong preorders for Samsung Omnia 7 and HTC 7 Mozart, Vodafone asked for a bigger shipment in order to meet bigger demand than expected, LG reported positive demand for the E900 7, Every manufacturerer expects at least 6 digit sales for the first Phone-7-quarter)
http://translate.google.de/translate?js=n&prev=_t&hl=de&ie=UTF-8&layout=2&eotf=1&sl=de&tl=en&u=http%3A%2F%2Fwww.n-tv.de%2Ftechnik%2FHTC-HD7-bei-O2-ausverkauft-article1817471.html (Google translation)
What do you think? Could WP7 be a success like Android?
Imagine not having GamePass on your console...