Windows Phone 7 Vs Android Vs iPhone (initial sales)

iPhone was released on 29 June 2007. From then till end of September 2007 (3 months) , Apple sold 1,389,000 iPhones. (Source : here)

iPhone sales in graph (Source : here)


Android was released in Fall 2008, from then for the next two quarters (6 months), 1million phones were sold. (Source : here)

Windows Phone 7 released in October 2010, has been reported by Microsoft to have sold 1.5million units in 6 weeks.(Source : here)

Does the simple comparison say something in Average Per Sales Day (APSD) for each OS?