Windows 10 Mobile goes to FCU 15254.124, Insiders Fast ring heads for 'RS4' and 2018
(All About Windows Phone)

People think of our OS being dead. Not quite. We`re still looking at (up to) just over two years of support in terms of monthly patches and fixes for Windows 10 Mobile. And build 15254.124 is fresh out today, so go grab it. In other news, the Fast ring on the Insiders finally gets a new build, on the way to a `Redstone 4`-compatible branch in 2018.