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Microsoft is discontinuing Windows Mixed Reality
(www.theverge.com)
This is a most excellent place for technology news and articles.
This was the core of why it was a poor product. It's only job was to pop up, annoy the user, while the user figured out how to minimize it to get to SteamVR.
If WMR was simply drivers or optional software it would have been fine all while still offering headsets for all budgets. Instead WMR is a required software which got in the way of actually using the product one bought.
When one plugs in a keyboard, they don't want the manufacturer's software to open on-screen just to use the keyboard, same for mice, same for monitors, same for VR headsets.