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Microsoft CEO Satya Nadella admits giving up on Windows Phone and mobile was a mistake
(www.theverge.com)
This is a most excellent place for technology news and articles.
I worked selling cellphones when Windows Phone was trying to compete. Their failure was lack of apps. From what I understand, it was difficult to port apps from Android or iOS to Windows Phone OS. It's a shame because the user experience was bar none. Hell, I installed a Windows OS theme on my Android for years. I still think they could make a comeback if they made an actual, honest to God Windows Phone that ran all Windows apps.
If they wanted to compete today, they'd fork Android in a similar fashion to how Edge moved to Chromium.