Another day, another high-profile name announces the end of support for Windows. In this case its the Khan Academy education app which abandons the Windows desktop, leaving users the web version as their only resource.
Just for a change there's no abandonment of Windows Mobile, because a Windows Phone app never existed.
A blog post on the not for profit's community web site announced the shuttering of the app, blaming high costs and low user numbers. Given that Windows 10 accounts for 400m users and the various flavours of Windows 8 another 50-100m, it seems surprising that user numbers aren't there.
Perhaps the failure here is in publicising the app, rather than in the app itself.