Microsoft Software Updates

Windows 10 Insider Previews: A guide to the builds

Get the latest info on new preview builds of Windows 10 as they roll out from Microsoft. Now updated for Insider Preview Build 21292 for the Dev Channel, released on Jan. 13, 2021.

Microsoft Software Updates

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Preview builds for the Beta and Release Preview Channels

Windows 10 Build 19042.746 (20H2)

Release date: January 12, 2021

Released to: Beta and Release Preview Channels

This build fixes a variety of security vulnerabilities, including one with HTTPS-based intranet servers, and a security bypass vulnerability in the way the Printer Remote Procedure Call (RPC) binding handles authentication for the remote Winspool interface.

There are also security updates to Windows App Platform and Frameworks, Windows Media, Windows Fundamentals, Windows Kernel, Windows Cryptography, Windows Virtualization, Windows Peripherals, and Windows Hybrid Storage Services. For details, see the Microsoft Security Update Guide.

There are two known issues in this update, including one in which system and user certificates might be lost when updating a device from Windows 10 version 1809.

What IT needs to know: Because this is a security update, it should be applied relatively soon. Over the next few weeks, check for reports about problematic issues, and if all seems well, apply the update.

(Get more info about Build 19042.746.)

Windows 10 Insider Preview Build 19042.685 (20H2)

Release date: December 8, 2020

Released to: Release Preview and Beta Channels

This build fixes a security vulnerability by preventing applications that run as a SYSTEM account from printing to “FILE:” ports. It also has security updates for the legacy version of Microsoft Edge, the Microsoft Graphics Component, Windows Media, Windows Fundamentals, and Windows Virtualization. For details, see the Microsoft Security Update Guide.

What IT needs to know: Because this is a security update, it should be applied relatively soon. Over the next few weeks, check for reports about problematic issues, and if all seems well, apply the update.

(Get more info about Insider Preview Build 19042.685.)

Windows 10 Feature Experience Pack 120.2212.1070.0

Release date: November 30, 2020

Released to: Beta Channel

This is the first build of a Microsoft Experience Pack, which offers a set of new features to Windows users outside the normal twice-yearly Windows 10 feature updates. This first early build was done more to test the process of releasing experience packs than to add any significant new features. Microsoft notes, “By testing this process first with Windows Insiders, we hope to expand the scope and the frequency of releases in the future.”

There are only two, minor new features in the build:

  • You can now use Windows 10's built-in screen snipping tool (press Windows key + Shift + S) to create a screenshot and save it in the folder you choose in File Explorer.
  • Split keyboard mode is now supported when you use the touch keyboard in portrait orientation on a 2-in-1 touch device.

To receive this update, Insiders in the Beta Channel must have 20H2 Build 19042.662 installed. To get the update, they’ll have to go to Settings > Update & Security > Windows Update and check for updates. Once they’ve installed the update, they’ll have to reboot to turn on the new features. They can check their Windows Feature Experience Pack version by going to Settings > System > About.

(Get more info about Feature Experience Pack 120.2212.1070.0.)

Windows 10 Insider Preview Build 19042.662 (20H2)

Release date: November 23, 2020

Released to: Release Preview and Beta Channels

This build has a wide variety of minor bug fixes and updates, including fixing an issue that caused a system to stop working during startup when the CrashOnAuditFail policy is set to 1 and command-line argument auditing is turned on, and fixing another issue that caused the Microsoft Management Console (MMC) Group Policy application to stop working when you are editing the Group Policy Security settings.

(Get more info about Insider Preview Build 19042.662.)

Windows 10 Insider Preview Build 19042.630 (20H2)

Release date: November 10, 2020

Released to: Release Preview and Beta Channels

This build updates the 2020 DST start date for the Fiji Islands to December 20, 2020 and includes security updates to the Microsoft Scripting Engine, Windows Input and Composition, Microsoft Graphics Component, the Windows Wallet Service, Windows Fundamentals, and the Windows Kernel. For details see the release notes for November 2020 Security Updates.

What IT needs to know: Because this is a security update, it should be applied relatively soon. Over the next few weeks, check for reports about problematic issues, and if all seems well, apply the update.

(Get more info about Insider Preview Build 19042.630.)

Windows 10 Insider Preview Build 19042.610 (20H2)

Release date: October 29, 2020

Released to: Release Preview and Beta Channels

This update for insiders on the 20H2 Windows 10 October 2020 Update includes all the fixes in the 20H2 Build 19042.608 build, plus one minor additional fix. It fixes a bug that caused the Docker pull operation to fail due to a Code Integrity (CI) Policy that blocks the import of a Windows container image.

(Get more info about Insider Preview Build 19042.610.)

Windows 10 Insider Preview Build 19042.608 (20H2)

Release date: October 22, 2020

Released to: Release Preview and Beta Channels

This update makes it easier to connect to others in Skype, using Meet Now from the taskbar. In addition, there are a wide variety of bug fixes, including for a bug that displayed the incorrect CPU frequency for certain processors, and another that displayed nothing on the screen for five minutes or more during a Remote Desktop Protocol (RDP) session.

(Get more info about Insider Preview Build 19042.608.)

Windows 10 Insider Preview Build 19042.572 (20H2)

Release date: October 13, 2020

Released to: Beta and Release Preview Channels

This build for Insiders who are on version 20H2 (the October 2020 Update) fixes a few minor bugs and includes a variety of security updates. Among the items fixed are an issue with creating null ports using the user interface, and another issue with a possible elevation of privilege in win32k.

Security updates were issued for Windows App Platform and Frameworks, Microsoft Graphics Component, Windows Media, Windows Fundamentals, Windows Authentication, Windows Virtualization, and Windows Kernel. For details, see the Release Notes for October 2020 Security Updates.

What IT needs to know: Because this is a security update, it should be applied relatively soon. Over the next few weeks, check for reports about problematic issues, and if all seems well, apply the update.

(Get more info about Insider Preview Build 19042.572.)

Windows 10 Insider Preview Build 19042.546 (20H2)

Release date: September 30, 2020

Released to: Beta and Release Preview Channels

This build for Insiders who are on version 20H2 (the Windows 10 October 2020 Update) includes all of the fixes included as part of 20H2 Build 19042.541, plus two minor bug fixes, one that had prevented a device from entering Modern Standby, and the other a reliability issue in Microsoft Edge that occurs when you open multiple windows or tabs.

(Get more info about Insider Preview Build 19042.546.)

Windows 10 Insider Preview Build 19042.541 (20H2)

Release date: September 22, 2020

Released to: Beta and Release Preview Channels

This build for Insiders who are on Windows 10 20H2 (the October 2020 Update) fixes a wide variety of bugs, including one in which the Windows Subsystem for Linux (WSL) failed to start with an “Element not found” error, another that caused random line breaks when you redirected PowerShell console error output, and another that prevented Microsoft Intune from syncing on a device using the virtual private network version 2 (VPNv2) configuration service provider (CSP).

(Get more info about Insider Preview Build 19042.541.)

Windows 10 Insider Preview Build 19042.508 (20H2)

Release date: September 18, 2020

Released to: Release Preview Channel

Microsoft says this build, previously released to the Beta Channel on Sept. 8., will be the final build for the Windows 10 October 2020 Update, barring unforeseen consequences. To get it, Insiders in the Release Preview Channel need to go to Settings > Update & Security > Windows Update and choose to download and install 20H2.

(Get more info about Build 19042.508.)

Windows 10 Insider Preview Build 19042.508 (20H2)

Release date: September 8, 2020

Released to: Beta Channel

This build includes security updates for Windows App Platform and Frameworks, Microsoft Graphics Component, Windows Input and Composition, Windows Media, Windows Shell, Windows Cloud Infrastructure, Windows Fundamentals, Windows Management, Windows Kernel, Windows Virtualization, Windows Storage and Filesystems, the Microsoft Scripting Engine, and the Microsoft JET Database Engine.

For details, see the Release Notes for September 2020 Security Updates.

The build also fixes a security vulnerability issue with user proxies and HTTP-based intranet servers, and addresses an issue with a possible elevation of privileges in windowmanagement.dll.

What IT needs to know: Because this is a security update, it should be applied relatively soon. Over the next few weeks, check for reports about problematic issues, and if all seems well, apply the update.

Note: Microsoft is releasing 20H2 to commercial customers in the Beta Channel and Release Preview Channel for pre-release validation. Get details in this blog post.

(Get more info about Insider Preview Build 19042.508.)

Windows 10 Insider Preview Build 19042.487 (20H2)

Release date: August 26, 2020

Released to: Beta and Release Preview Channel (commercial customers)

The build fixes a wide variety of bugs, including one in which add-ins caused Microsoft Outlook to become unresponsive, another in which a black screen was displayed to Windows Virtual Desktop (WVD) users when they attempted to sign in, and another in which Dynamic Data Exchange (DDE) caused a memory leak when multiple clients connected to the same server.

Note: Microsoft is releasing this build to commercial customers in the Beta Channel and Release Preview Channel for pre-release validation. Get details in this blog post.

(Get more info about Insider Preview Build 19042.487.)

Windows 10 Insider Preview Build 19042.450 (20H2)

Release date: August 11, 2020

Released to: Beta Channel

This build includes security updates for the Microsoft Scripting Engine, Internet Explorer, Windows Graphics, Microsoft Graphics Component, Windows Kernel, Windows Input and Composition, Windows Media, Windows Shell, the Windows Wallet Service, Microsoft Edge Legacy, Windows Cloud Infrastructure, Windows Authentication, the Windows AI Platform, Windows Fundamentals, Windows Storage and Filesystems, Windows Update Stack, Windows File Server and Clustering, Windows Hybrid Storage Services, Windows App Platform and Frameworks, the Microsoft JET Database Engine, and Windows SQL components.

For details, see the Release Notes for August 2020 Security Updates.

The build also fixes an issue in Universal Windows Platform (UWP) apps that allows single sign-on authentication when an app does not have the Enterprise Authentication capability.

What IT needs to know: Because this is a security update, it should be applied relatively soon. Over the next few weeks, check for reports about problematic issues, and if all seems well, apply the update.

(Get more info about Insider Preview Build 19042.450.)

Windows 10 Insider Preview Build 19042.423 (20H2)

Release date: August 5, 2020

Released to: Beta Channel

This build is a re-release of 20H2 19042.421 (see below), released on July 24 to the Beta Channel. It was released in order to bring it to parity with the KB4568831 update for Windows 10 version 2004.

(Get more info about Insider Preview Build 19042.423.)

Windows 10 Insider Preview Build 19042.421 (20H2)

Release date: July 24, 2020

Released to: Beta Channel

The update includes a minor change to the look of the Start menu, removing the solid color backplates behind the logos in the apps list and giving a partially transparent background to the tiles. In addition, all of your open tabs in Microsoft Edge will appear when you use Alt-Tab, not just the active one in each browser window.

The update also includes a new feature for Microsoft Edge, in which when you pin a web site to the taskbar, when you click it, all the open tabs for the site will display in Edge. Note that existing sites on your taskbar will not use this new behavior until you remove and re-pin them.

New users of Windows will also get a more personalized, less cluttered taskbar. The taskbar will automatically adjust itself to the way in which you use Windows. You can also now more easily dismiss notifications, by clicking the X at the upper right of their screens.

More settings information has been moved from Control Panel into the Settings app. Links that used to open the System page in Control Panel now direct you to About in Settings.

There are also many bug fixes, including one that could cause Microsoft browsers to incorrectly bypass proxy servers, and another that caused the Settings page to close unexpectedly, preventing default applications from being set up properly.

There are no known issues in this build.

(Get more info about Insider Preview Build 19042.421.)

Windows 10 Insider Preview Build 19042.388 (20H2)

Release date: July 14, 2020

Released to: Beta Channel

This update offers a few minor bug fixes and multiple security updates. It fixes an issue that can cause certain games and applications to have visual distortions when resizing in windowed mode or switching from full screen to window mode, and another that might prevent some older devices with older apps and legacy file system drivers from connecting to OneDrive using the OneDrive app.

This build has security updates for Microsoft Scripting Engine, Windows App Platform and Frameworks, the Microsoft Store, Windows Graphics, Windows Input and Composition, Windows Media, Windows Shell, Windows Fundamentals, Windows Management, Windows Kernel, Windows Hybrid Cloud Networking, Windows Storage and Filesystems, Windows Update Stack, Windows MSXML, Windows File Server and Clustering, Windows Remote Desktop, Internet Explorer, Microsoft Edge Legacy, and the Microsoft JET Database Engine. For details, see this page about the July 2020 Security Updates.

What IT needs to know: Because this is a security update, it should be applied relatively soon. Over the next few weeks, check for reports about problematic issues, and if all seems well, apply the update.

(Get more info about Insider Preview Build 19042.388.)

Windows 10 Insider Preview Build 19042.330 for 20H2

Release date: June 16, 2020

Released to: Beta Channel (formerly called the Slow ring)

This is the first Windows Insider Preview build for the next Windows 10 upgrade, code-named 20H2. It includes fixes from the KB4557957 (OS Build 19041.329) build for the Windows 10 May 2020 Update, as well as the new Microsoft Edge based on Chromium.

In order to get the build, you’ll have to go to Settings > Update & Security > Windows Update and choose to download and install 20H2. Once you’ve updated your PC to 20H2, you will continue to receive 20H2 updates through Windows Update.

(Get more info about Insider Preview Build 19042.330.)

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