Announcing Windows 10 Insider Preview Build 16188 for PC + Build 15210 for Mobile

Hello Windows Insiders!

Today we are excited to be releasing Windows 10 Insider Preview Build 16188 for PC to Windows Insiders in the Fast ring. We are also releasing Windows 10 Mobile Insider Preview Build 15210 to Insiders in the Fast ring.

NOTE: This build will not be available for Windows Insiders on Windows 10 Enterprise Insider Preview builds in these languages: AR-SA, DA-DK, EN-GB, ES-MX, FI-FI, FR-CA, NB-NO, and TH-TH.

What’ New in Build 16188 For PC

Awesome new features in Microsoft Edge’s PDF Reader: In addition to addressing a lot of Insider feedback on PDF functionality in Microsoft Edge, this build is also packed with a bunch of new features for reading PDFs in Microsoft Edge that we want you to check out. Here is the description of the features to look out for:

Make Web Note button

Using different modes in the annotations bar, you can ink on the PDF, highlight text and erase your annotations. You can save the work onto the PDF file for later use.

Write in PDFs in Microsoft Edge!

Navigate large PDF files with Table of Contents

New PDF layout options

Windows Defender Application Guard: Announced last September in the Microsoft Edge Blog, Windows Defender Application Guard for Microsoft Edge is now available in Windows Insider Previews for Enterprise users in the Fast Ring. Microsoft Edge running in Application Guard provides enterprises the maximum level of protection from malware and zero day attacks against Windows. We’ve made it easy to test drive Microsoft Edge with Application Guard. First, turn on Windows Defender Application Guard using the “Turn Windows features on or off” dialog. Select the checkbox as shown below for Windows Defender Application Guard.

Enable Windows Defender Application Guard

Click OK and then restart your computer.

Next, open Microsoft Edge and then click the Edge menu. You’ll see a new menu choice for “New Application Guard window.”

New menu choice for “New Application Guard window.”

When you click this, a new Edge Window will open in . You’re ready to enter any website address in the address bar to visit and that session will be isolated in Application Guard.

New Application Guard window.

We are looking forward to your feedback, here is a link to reach us on Feedback Hub.

See this forum post for more details.

Note: Windows Defender Application Guard requires Windows 10 Enterprise Edition and Hyper-V. Your PC must be capable of running Microsoft Hyper-V to use Application Guard.

Ninjacat Icon for Windows Insider Program in Settings: Check out the new Ninjacat icon representing the Windows Insider Program under Settings > Update & security > Windows Insider Program.

Ninjacat icon!

Ninjacat icon in the Settings app

Cortana’s settings have been integrated into Settings: Cortana is a core component of Windows and users look to the Settings app to find Cortana’s settings. We’ve heard your feedback about discoverability, and with this build, we’ve made the change to migrate all of Cortana’s settings into Settings. You can access them by clicking the settings gear in Cortana, going to Settings > Cortana, or just searching for the setting you’re interested in.

Cortana settings now in Settings app

A reimagined Magnifier Settings page: In order to improve the experience both for low vision users, as well as casual Magnifier users who use it for presentations or quick zooming, we’ve updated the Magnifier Settings page. Insiders will notice that the page has not only been redesigned, but also comes with a few new features, namely:

Reimagined Magnifier Settings page

If you’re a Magnifier user, please try it out and share your feedback!

Improving your update experience: We’ve heard your feedback, and with Build 16188 we’ve replaced the previous modal Windows Update dialog with a new interactive toast notification so you can easily be aware of an available update without it interrupting your work. Try it out next time you get an update, and as always, please share your feedback!

Changes, improvements, and fixes for PC

Known issues for PC

Changes, improvements, and fixes for Mobile

Known issues for Mobile

Community Updates

Today is the annual Microsoft Ability Summit – the day we bring together all of the teams at Microsoft to plan how to Inspire > Build > Enable technology for our community who have “special abilities”. The #WindowsInsiders will play a major role with a big session on Being Obsessed with Customer Feedback where we will talk about co-creating Windows with our community members who do have special abilities. We take our mission to empower EVERY person on the planet to do the thing very seriously.

To continue the theme of different learning and consumption styles, we are also publishing our second Windows Insiders podcast featuring Windows Insiders product owner and I talking about the program and more!

One more thing…

Mark your calendars: On May 9, 2017, William Devereux from the OneNote team will be taking over the @OfficeInsider Twitter account to give you a behind-the-scenes look at the OneNote Team and a chance to win prizes!* This is your chance to ask William questions about OneNote, share your ideas, chat about the product, and find new features that are available exclusively to Windows Insiders. For more details, head on over to

*Contest open to residents of the U.S. and Canada.

May the 4th be with you. Keep hustling team,
Dona <3