Why two builds so fast back to back?! As you probably know, we validate builds that we produce in internal rings where they’re used by engineers in OSG and Microsoft. If they pass all of our criteria we make them available to Windows Insiders, first to Fast and then to Slow once we know it’s a stable build. We’d been using 10158 for almost a week and knew it was going to be a strong build, and the data backed that up so we released it yesterday. Hot on its heels though was build 10159, which in addition to more fixes (over 300 of them!), took in one very interesting change. We didn’t want to wait with 10158 so we went ahead and released that build while we were still evaluating 10159. As it turns out though, 10159 is also a great build and passes our criteria for the Windows Insider Fast ring.
If you are in the inner ring, you should be getting notification to install the latest build which is closer to the end product. This new build also has a
Build 10159, released to the Fast ring. You will see the new Microsoft Edge replacing Spartan.