That prediction about Windows Phone was made in early 2011, from 2010 data, before Windows had seen any marketshare growth. It's basically a worthless projection based on gut feelings and not actual data. In fact they project that Windows Phone will be at 10.8% by 2012, when in fact Microsoft is at 3.5% in 2012.
The projection makes assumptions that didn't happen, like that Symbian share would convert into Windows share (didn't happen), and predates the Windows Phone 8 and the compatibility kerfuffle (WP7 and WP8 aren't backwards or forwards compatible), etc.
Also their prediction of RIM falling to 11% by 2015 is laughable since RIM already fell to 4.2% by 2012.--
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