Microsoft has officially called time on any further development of its Windows 10 Mobile operating system. Once one of the dominant mobile operating systems on the market, it quickly faded with the rise of iOS and Android.
https://www.notebookcheck.net/Windows-10-Mobile-is-on-life-support-no-new-features-in-the-pipeline.257714.0.html
About time they used their own brand's pocketable/wearable mobile device. Maybe adding 4/5G support to hololens would be enough. It would be definitely device worthy to pay for, 1300+ & 24months.
At least, Blackberry added Android apps support for their OS. Microsoft did opposit - removed it from W10 builds in 2015....