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First Windows 10 19H1 preview build 18204 released

Microsoft released yesterday (July 25th) two new Insider builds, build 17723 on RS5 Fast Ring and first Skip Ahead build 18204 on 19H1 branch. I must admit the Skip Ahead build was released much earlier than I had expected (read more).

Image from Windows Insider Blog.

At this point, both of the Fast Ring and Skip Ahead builds are identical; they only difference by the watermark that appears at the bottom right on the desktop. Skip Ahead will start diverging from Fast Ring builds quite soon, with each new build taking Skip Ahead closer to the 19H1 release while Fast Ring builds will evolve to result in RS5 version 1809.

There’s not much new in either of these two builds. The most notable new features are Leap Second Support and the Precision Time Protocol, which according to Microsoft will now improve time accuracy by leveraging a new time protocol that delivers far more accurate time samples to the endpoint (Windows Server 2019 or Windows 10, host or virtual machine).

From my point of view, however, the most interesting new feature involves the update experience. Quoting from the Insider Blog we read:

Have you ever had to stop what you were doing, or wait for your computer to boot up because the device updated at the wrong time? We heard you, and to alleviate this pain, if you have an update pending we’ve updated our reboot logic to use a new system that is more adaptive and proactive. We trained a predictive model that can accurately predict when the right time to restart the device is. Meaning, that we will not only check if you are currently using your device before we restart, but we will also try to predict if you had just left the device to grab a cup of coffee and return shortly after.

One new feature which wakens my interest but still seems to be under development and not working yet is this item I first noticed in a fellow Finn’s tweet:

What that means, we can only guess, but it for sure promises something interesting. Native support for virtual machines even without Hyper-V would be great.

All you Insiders and Insiders for Business, if you do not want to upgrade to 18204, download the UUP files and create an ISO to test it on a VM, or on native boot VHD in case you want to see it in action on real physical hardware.


Author: Kari Finn

A former Windows Insider MVP, Kari started in computing in the mid 80’s writing code for VAX / VMS systems. Since then, he’s worked in a variety of IT positions. He specializes in Windows image capture, customization, repair and deployment as well as Hyper-V virtualization. Kari is a proud Team Member at number #1 Windows site TenForums.com.

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