It's time for Microsoft to push Windows 10 Mobile to 8.1 devices

[Windows Central]

Windows 10 Mobile is still an opt-in upgrade for eligible Windows Phone 8.1 devices. But it's time for Microsoft to change that.
In March of 2016, Microsoft announced that Windows 10 Mobile would finally be coming to select Windows Phone 8.1 devices. That was great news, because it meant developers could finally start building their Universal Windows Platform (UWP) apps for phones and there would be less need to cater to the older Windows Phone 8.1 app module. Unfortunately, Microsoft decided to make the Windows 10 Mobile update "opt-in" via an app that you have to download in the Store, meaning the vast majority of people still using Windows Phone 8.1 didn't actually get the update.

Full story from the WindowsCentral blog...