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Microsoft is discontinuing Windows Mixed Reality
(www.theverge.com)
This is a most excellent place for technology news and articles.
Windows Phone's problem was Steve Balmer, and it was insurmountable. They delayed entering the market for too long and without a large enough user base, there was no way forward to get any real traction in attracting large enough numbers of application developers.
Not enough app developers means dismissal app marketplace means inferior overall user experience relative to Android and iOS, no matter how good the overall hardware or OS was on Windows Phones.
For what it's worth, Satya shutting it down it wasn't any better. At least with Balmer, it may still be alive today. It was actually doing pretty well in certain markets in Europe. All of which they threw away very quickly after Satya took over.
I'm not as familiar with Balmer's time but it sure seems MS under Satya was way more trigger happy when it comes to cancelling and deprecating products.