Microsoft Eyes the Finish Line with New Windows 10 19H1 Build

Posted on March 16, 2019 by Paul Thurrott in Windows 10 with 11 Comments

Microsoft Delivers Windows 10 Insider Preview Build 14905 for PC and Mobile

Microsoft has issued Windows 10 Insider Preview Build 18358 to Insiders on the Fast ring. This one fixes a few more issues and introduces a Windows Defender Application Guard browser extension for businesses using Chrome and Firefox.

“We are releasing Windows 10 Insider Preview Build 18358 (19H1) to Windows Insiders in the Fast ring,” Microsoft’s Dona Sarkar announced last night.

There’s not too much to say here from a fixes/known issues perspective: Microsoft addressed a problem with Game Mode and is still looking for people to test … something … related to gaming via a free version of State of Decay. But nothing major.

Unrelated to the actual build, really, Microsoft is also making browser extensions available for its Windows Defender Application Guard to users of Google Chrome and Mozilla Firefox. This technology is already available for Microsoft Edge as well.

“To extend our container technology to other browsers and provide customers with a comprehensive solution to isolate potential browser-based attacks, we have designed and developed Windows Defender Application Guard extensions for Google Chrome and Mozilla Firefox,” Ms. Sarkar writes. “The extensions for Google Chrome and Mozilla Firefox automatically redirect untrusted navigations to Windows Defender Application Guard for Microsoft Edge.”

To use Windows Defender Application Guard, and thus these extensions, your PC must meet certain requirements, and you must be using Windows 10 Pro 1803 or better. Your PC must also be managed by Microsoft Intune, System Center Configuration Manager, or Active Directory (AD) Group Policy (GP). So, yes, it’s only for business users.

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Comments (11)

11 responses to “Microsoft Eyes the Finish Line with New Windows 10 19H1 Build”

  1. dcdevito

    All I want is better tablet mode on my Surface Pro

  2. Dan1986ist

    This took several tries to install on my Venue 8 Pro due to an IRQL Not less or equal GSOD caused by the wifi driver, but eventually was able to get 18358 to install and boot to the desktop.


  3. BruceR

    "Your PC must also be managed by Microsoft Intune, System Center Configuration Manager, or Active Directory (AD) Group Policy (GP). So, yes, it’s only for business users."


    Not true.

  4. zeratul456

    Now if only they could fix WDAG. I keep getting an error whenever I try to run it for Edge.

  5. IanYates82

    I feel the browser extensions stuff deserved its own article.

    There's some interesting concepts at play here, and it seems Microsoft is well on its way to getting some of their Edge security features into their "edgium" version of Chromium.

    • IanYates82

      In reply to IanYates82:

      I'm a little confused - the Microsoft announcement indicates you need Enterprise 1709 (which I'm running) or Pro 1803, but then talks about it rolling out to insider builds (which are 1903...?).


      (reads a lot more - several links away from the post)...


      Ahh. So the new function being introduced in 1903 is the ability to have an untrusted site running in the app guard container contain a link back to a trusted site. Right now if you click that link you'd still be in the container even though you're back on a trusted site. 1903 will bring the ability to have the trusted site spawn back in a regular trusted browser.

      This works with Chrome / Firefox in a way that's not immediately obvious from the blog post.


      What actually happens... Chrome/Firefox are your default browser. You visit an untrusted site - the plugin intercepts this and launches EDGE but in an app guard container. Whilst you're browsing the wild west web in your Edge browser in the app guard container and you click on a link for a trusted site, what can now happen, thanks to the new functionality in 1903, is that you'll get that trusted site opening again in your *default* browser (presumably the one with the plugin - Chrome / Firefox)


      So Edge is still a part of the picture here. I wonder how far along they are with getting "Edgium" into this extra app guard sandbox they've designed, and how this plays with the new general sandboxing technology they're adding to 1903.

      Any tech details from Raphael perhaps??

      Thanks :)

  6. michael94

    Sounds Good, Let's see, waiting on this windows update and I hope it improves the performance with some bugs fixes and improve security! Waiting for the update.

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