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 20185 for the Dev Channel, released on Aug. 5, 2020.

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Microsoft never sleeps. Even before Microsoft made the Windows 10 May 2020 Update (version 2004) generally available to users, the company began working on upcoming feature updates to Windows 10. As it did with version 2004, Microsoft has been releasing a series of public preview builds to members of Microsoft's Windows Insider Program.

After years of using “Redstone” in its code names for upcoming releases, Microsoft switched to a new format with version 1903, released in May 2019. The code names now use a YYH1/YYH2 format, with the YY standing for the last two numbers of the year and H1 or H2 referring to the first or second half of the year. So Windows 10 version 2004, which was released in May 2020, was code-named “20H1” (for first half of 2020). The next feature update, due in the fall of 2020, is code-named 20H2.

In June 2020, Microsoft also changed the terminology it uses for releasing new preview builds, changing its longstanding “ring” model to a channel model. The new Dev Channel generally corresponds to the old Fast ring; it’s where new features are introduced for initial testing, regardless of which Windows 10 release they’ll eventually end up in. This channel is best for technical users and developers, and builds in it may be unstable and buggy.

The Beta Channel corresponds to the old Slow ring. Here you’ll get more polished features that will be deployed in the next Windows 10 feature update; at the moment that’s Windows 10 20H2. This channel is best for early adopters, and Microsoft says your feedback in this channel will have the most impact. The Release Preview Channel, unsurprisingly, corresponds to the old Release Preview ring. It usually doesn’t see action until shortly before a new feature update is rolled out; it’s meant for final testing of an upcoming release and is best for those who want the most stable builds.

Existing Insiders don’t need to do anything to choose the correct channel: Those in the Fast ring will automatically be moved to the Dev Channel, those in the Slow ring will be moved to the Beta Channel, and those in the Release Preview ring will be moved to the Release Preview Channel.

Use the links below to find information about preview builds that have been released to each of the three channels:

For each build, we've included the date of its release, which Insider channel it was released to, a summary of what’s in the build, and a link to Microsoft's announcement about it. After that you’ll find summaries of all the preview builds that led up to prior feature updates, from the May 2020 Update (version 2004, code-named 20H1) on back to the Windows 10 Creators Update (version 1703, code-named Redstone 2).

Note: If you're looking for information about updates being rolled out to all Windows 10 users, not previews for Windows Insiders, see “Windows 10: A guide to the updates.”

Preview builds for the Dev Channel (formerly Fast ring)

Windows 10 Insider Preview Build 20185

Release date: August 5, 2020

Released to: Dev Channel

The build makes several changes to the Network section in Settings, including making DNS settings more accessible and letting you configure encrypting DNS controls in Settings. In addition, the Your Phone app can now run your Android applications on your PC from your phone.

The build also includes a wide variety of bug fixes, including for one in which the “close all windows” action in the taskbar didn’t always close all of the open tabs for pinned sites, and another in which dragging and dropping an app from Start menu’s “all apps” list over to the tile grid to pin it wasn’t working for certain apps.

There are nine known issues in this build, including one in which some Microsoft Store games protected with Easy Anti-Cheat may fail to launch, and another in which Alt + Tabbing to a browser tab sometimes moves the previously active browser tab to the front of the Alt + Tab list.

(Get more info about Insider Preview Build 20185.)

Windows 10 Insider Preview Build 20180

Release date: July 29, 2020

Released to: Dev Channel

This update turns on new features first announced in the 20161 Insider build on July 1, including theme-aware tiles on the Start menu. Until now, only a small subset of Insiders have received those features.

Aside from that, the build it has only a few fixes and changes, including one that shrinks the new folder icon in the Start menu’s “All apps” list so it better aligns with the size of the other icons, another that fixes issues that could cause crashes when using Alt-Tab to switch to browser tabs.

There are ten known issues in this build, including one in which some Microsoft Store games protected with Easy Anti-Cheat may fail to launch, and another in which Alt-Tabbing to a browser tab sometimes moves the previously active browser tab to the front of the Alt-Tab list.

Note: Insider Preview Builds 20161 and below will expire on July 31st. To avoid the expiration, update to Insider Preview Build 20170 or newer.

(Get more info about Insider Preview Build 20180.)

Windows 10 Insider Preview Build 20175

Release date: July 22, 2020

Released to: Dev Channel

This update includes a new feature for Microsoft Edge, in which when you pin a web site to the taskbar, clicking it displays all the open tabs for the site in Edge. Note that existing sites pinned to your taskbar will not use this new behavior until you remove and re-pin them. The build also includes new icons for Sticky Notes and Snip & Sketch.

There are also a number of bug fixes, including for one in which tiles sometimes flashed unexpectedly in the Start menu when animating, and another in which Search didn’t close after selecting certain items in the search results.

There are ten known issues in this build, including one in which the update process may hang for extended periods of time when attempting to install a new build, and another in which live preview doesn’t work for pinned site tabs.

Note: Insider Preview Build 20161 and earlier builds will expire on July 31st. To avoid the expiration, update to Insider Preview Build 20170 or newer.

(Get more info about Insider Preview Build 20175.)

Windows 10 Insider Preview Build 20170

Release date: July 15, 2020

Released to: Dev Channel

This update makes changes to the Windows search bar. There’s a new two-column layout that lets you do searches more quickly and offers easier access to Quick Searches, which display local weather, top news, and other information.

In addition, you can now manage your sound devices in Settings, rather than in Control Panel. Go to Settings > System > Sound > Manage sound devices to see which sound device is the default and to set up a new default device or default communication device.

There are also a number of bug fixes, including for one in which the master volume slider in Sound Settings wouldn’t work after removing and re-pairing certain Bluetooth devices, and another in which modifier keys like Shift and Ctrl sometimes were dropped over a remote desktop connection.

There are six known issues with this build, including one in which the update process may hang for extended periods of time when attempting to install a new build, and another in which Task Manager reports 0.00 GHz CPU usage in the Performance tab.

The notes about the build also include a link to the just-released Microsoft Launcher v6, a launcher app for Android phones. Download it here.

Note: Windows Insiders with PCs that have AMD processors are not being offered this build because of a bug that affects the overall usability of these PCs. Microsoft expects the issue will be resolved by the time the next build is released.

(Get more info about Insider Preview Build 20170.)

Windows 10 Insider Preview Build 20161

Release date: July 1, 2020

Released to: Dev Channel

This update offers a variety of new features, including what Microsoft calls “freshening up the Start menu.” The colors behind app logos in the apps list have been removed, and tiles now have partially transparent backgrounds. In addition, in Microsoft Edge all open tabs will now appear when you use Alt + Tab. Microsoft is also taking information previously shown only in the Control Panel and displaying it in System > Settings > About.

There are a variety of bug fixes, including for one that caused some games and applications to crash at launch or fail to install, and another that caused some Bluetooth devices to no longer show their battery level in Settings.

There are seven known issues with this build, including one in which the update process may hang for extended periods of time when attempting to install a new build, and another in which Task Manager reports 0.00 GHz CPU usage in the Performance tab.

(Get more info about Insider Preview Build 20161.)

Windows 10 Insider Preview Build 19645

Release date: June 10, 2020

Released to: Fast ring

This minor update fixes seven very minor bugs, including one in which some devices booting from eMMC storage bug checked when resuming from hibernate, another in which taskbar preview thumbnails weren’t rendering consistently (showing a blank area), and another in which Windows Hello Setup would crash if facial recognition was already set up and you chose the Improve Recognition button.

There are two known issues with this build, one in which the update process may hang for extended periods of time when attempting to install a new build, and the other in which under Settings > Privacy, the Documents and Downloads sections show a broken icon next to their page name.

(Get more info about Insider Preview Build 19645.)

Windows 10 Insider Preview Build 19640

Release date: June 3, 2020

Released to: Fast ring

This extremely minor update disables the option to have Storage Sense automatically clear out your Downloads folder on a cycle if your Downloads folder is synced to a cloud provider. It also updates Windows’ login logic, so if your PC is set up so you need to type in your username when logging in, accidentally starting your username with a space will no longer result in an error.

There are several known issues with this build, including one in some devices booting from eMMC storage may bug check when resuming from hibernate, and another in which under Settings > Privacy the Documents and Downloads sections show a broken icon next to their page name.

(Get more info about Insider Preview Build 19640.)

Windows 10 Insider Preview Build 19635

Release date: May 28, 2020

Released to: Fast ring

This extremely minor update fixes several issues, including one that caused constant display flashing on certain devices, and another that caused Settings to crash when changing the display orientation or resolution.

There are several known issues with this build, including one in which some devices booting from eMMC storage may bug check when resuming from hibernate, and another in which under Settings > Privacy, the Documents and Downloads sections show a broken icon next to their page name.

(Get more info about Insider Preview Build 19635.)

Windows 10 Insider Preview Build 19631

Release date: May 21, 2020

Released to: Fast ring

This extremely minor update fixes several issues, including one that caused a device’s IIS configuration to be set to default after installing a new build, and another that made Remote Desktop less reliable.

There are several known issues with this build, including one in which some devices booting from eMMC storage may bug check when resuming from hibernate, and another in which in Settings > Privacy, the Documents and Downloads sections show a broken icon next to their page name.

(Get more info about Insider Preview Build 19631.)

Windows 10 Insider Preview Build 19628

Release date: May 13, 2020

Released to: Fast ring

This extremely minor update adds a new feature that lets you opt in to have Windows use encryption when making DNS queries. It also fixed an issue that caused some devices to fail to update with error code 0xc0000409.

There are several known issues with this build, including one in which Narrator and NVDA users who seek the latest release of Microsoft Edge based on Chromium may experience some difficulty when navigating and reading certain web content, and another in which the update process may hang when a new build is installed.

(Get more info about Insider Preview Build 19628.)

Windows 10 Insider Preview Build 19624

Release date: May 6, 2020

Released to: Fast ring

This minor build offers a variety of small changes and bug fixes, including fixing an issue that caused unexpected flickering across Windows shell surfaces and apps in the last two builds, and another that resulted in certain Bluetooth mice being very slow to reconnect to devices after they have been asleep.

There are several known issues in this build, including one in which Narrator and NVDA users who seek the latest release of Microsoft Edge based on Chromium may experience some difficulty when navigating and reading certain web content, and another in which Windows Security’s Core Isolation doesn’t work on some devices.

(Get more info about Insider Preview Build 19624.)

Windows 10 Insider Preview Build 19619

Release date: April 29, 2020

Released to: Fast ring

This minor build lets you control your music and audio from inside the Your Phone app and makes it easy to keep up with the latest news about the coronavirus pandemic using Windows Search. To do keep updated, select “View interactive map” or “See headlines” to get local, national and international news about the pandemic.

The build also offers a variety of fixes, including for a bug that had caused Insiders to have bug checks with the error DPC WATCHDOG VIOLATION, and another that resulted in some unexpected characters showing up in the text strings of intl.cpl’s Additional Settings > Currency.

There are six known issues in this build, including one in which Narrator and NVDA users that seek the latest release of Microsoft Edge based on Chromium may experience some difficulty when navigating and reading certain web content, and another in which the Documents and Downloads sections under Privacy show a broken icon next to their page name.

(Get more info about Insider Preview Build 19619.)

Windows 10 Insider Preview Build 19613

Release date: April 22, 2020

Released to: Fast ring

This minor build turns on Bing Answers in Cortana for a wide variety of regions and languages. It also has nine fixes, including for a bug that caused app icons in the taskbar to display incorrectly, including defaulting to the .exe icon. This issue also caused some Insiders to have more reliability issues with explorer.exe.

There are six known issues in this build, including one in which Narrator and NVDA users that seek the latest release of Microsoft Edge based on Chromium may experience some difficulty when navigating and reading certain web content, and another in which Settings crashes when installing a font.

(Get more info about Insider Preview Build 19613.)

Windows 10 Insider Preview Build 19608

Release date: April 15, 2020

Released to: Fast ring

This build includes a new feature for the Your Phone app that lets your drag and drop files between a PC and a phone. For now, it only works on certain Samsung smartphones.

In addition, when you’re setting default apps for your PC, you can now search by file types, protocols, and apps.

There are half a dozen bug fixes in the build, including for one in which Sticky Notes windows couldn’t be moved, and another that caused the Snip & Sketch App to launch in the background instead of the foreground (and be on top of all windows) when the app was invoked via pen click.

There are seven known issues in this build, including one in which Narrator and NVDA users that seek the latest release of Microsoft Edge based on Chromium may experience some difficulty when navigating and reading certain web content, and another in which the Documents and Downloads sections under Privacy show a broken icon next to their page name.

(Get more info about Insider Preview Build 19608.)

Windows 10 Insider Preview Build 19603

Release date: April 8, 2020

Released to: Fast ring

This build integrates File Explorer with the Windows Subsystem for Linux (WSL). When you launch File Explorer, you’ll see a Linux folder, which you can browse. There’s also a new feature in Storage Settings that displays your unused files and apps, so you can more easily clean your hard disk.

The build also introduces the beta of a new Windows 10 app, Microsoft News Bar, which displays the latest news and stock information. Eventually, weather and sports information will be added as well.

A wide variety of bugs were fixed, including one in which some devices experienced a bug check (GSOD) during the reboot to install an update, and another in which files could not be dragged and dropped onto the root of a network share folder.

There are nine known issue in this build, including one in which the Documents section under Privacy has a broken icon and another in which Narrator and NVDA users that seek the latest release of Microsoft Edge based on Chromium may experience some difficulty when navigating and reading certain web content.

(Get more info about Insider Preview Build 19603.)

Windows 10 Insider Preview Build 19592

Release date: March 25, 2020

Released to: Fast ring

The primary improvement in this build gives people with 2-in-1 convertibles a tweaked desktop interface, primarily designed for touch. It includes these changes:

  • The taskbar icons are spaced out
  • The Search box on the taskbar is collapsed into icon-only mode
  • The touch keyboard auto invokes when you tap a text field
  • File Explorer elements have a little more padding, to make them comfortable to interact with using touch

There are also eight bug fixes in the release, including for one that could have resulted in the Optional Features page in Settings appearing blank, and another in which the corruption repair (DISM) process stopped at 84.9%.

There are several known issue in this build, including one in which the update process hangs for extended periods of time when attempting to install a new build, another in which the Documents section under Privacy has a broken icon, and another in which Narrator and NVDA users that seek the latest release of Microsoft Edge based on Chromium may experience some difficulty when navigating and reading certain web content.

(Get more info about Insider Preview Build 19592.)

Windows 10 Insider Preview Build 19587

Release date: March 18, 2020

Released to: Fast ring

This build has a small number of minor bug fixes and changes. Your PC’s volume now won’t unmute when using the hardware keyboard volume keys until you raise the volume (or manually unmute). Among the bugs fixed are one in which the new icon next to “Scan with Microsoft Defender” in File Explorer’s context menu didn’t have a transparent background, and another that could result in the search box being missing from some apps.

There are several known issue in this build, including one in which the update process hangs for extended periods of time when attempting to install a new build, and another in which Narrator and NVDA users that seek the latest release of Microsoft Edge based on Chromium may experience some difficulty when navigating and reading certain web content.

(Get more info about Insider Preview Build 19587.)

Windows 10 Insider Preview Build 19582

Release date: March 12, 2020

Released to: Fast ring

This build has new settings pages for Eye Control, which lets you control Windows with eye movements. In addition, a variety of features have been added to the Your Phone app for Samsung Galaxy S20 and Galaxy Z Flip, including Rich Communication Service messaging and copying and pasting text and images between devices.

There are also a variety of fixes, including for an issue caused some attempts to update to a build to result in error 0x8007042, and another that caused Task Manager to show “Unavailable” DPI Awareness for all processes.

There are seven known issues in this build, including one in which Narrator and NVDA users who use the Chromium version Microsoft Edge may experience difficulty when navigating and reading certain web content.

(Get more info about Insider Preview Build 19582.)

Windows 10 Insider Preview Build 19577

Release date: March 5, 2020

Released to: Fast ring

This build makes a minor change to how commercial customers can customize any diagnostic Windows data they opt to send Microsoft. They now have more granular controls over the data they can choose to share. The build also includes an updated version of PowerToys with minor changes, including almost 300 additional unit tests to increase stability and prevent regressions.

There are also a wide variety of fixes, including for an issue in which input stopped working in some places if clipboard history was dismissed without pasting anything, and another in which when using Storage Sense to clean up Windows.old, not all of the data was removed.

There are 10 known issues in this build, including one in which Narrator and NVDA users that use the Chromium version Microsoft Edge may experience difficulty when navigating and reading certain web content, and another in which the Documents section under Privacy has a broken icon.

(Get more info about Insider Preview Build 19577.)

Windows 10 Insider Preview Build 19569

Release date: February 20, 2020

Released to: Fast ring

This build updates the icons for built-in apps including Alarms & Clock, Calculator, Mail, and Calendar, an initial step toward updating all Windows icons. For more details, see this post from the Microsoft Design Team.

The build also fixes several issues and bugs, including one that affected Start menu reliability, and another that stopped OneDrive from working and also using an unexpectedly high amount of CPU for some users.

There are a number of known issues in this build, including one in which Narrator and NVDA users may experience difficulty when navigating and reading certain web content in the new Chromium version of Microsoft Edge, and another in which the Documents section under Privacy has a broken icon.

(Get more info about Insider Preview Build 19569.)

Windows 10 Insider Preview Build 19564

Release date: February 12, 2020

Released to: Fast ring

This build offers a preview of a new version of the Windows 10 Calendar app. The app has more than 30 new themes; adds an agenda pane to the month view, letting you see a day’s events at a glance; a simpler way to create a new event; and a smaller account navigation pane, so there’s more room to see a day’s events. To see the new app preview, go to the Calendar app and toggle it on. You can toggle it off when you want to go back to the old version of the app.

The build also has an updated Graphics settings page, giving you more control over which GPU apps run on.

There are also nearly two dozen bug fixes, including for one that caused some devices to not sleep on idle and another that could result in a deadlock (in which everything freezes) when using your PC.

There are seven known issues in this build, including one in which the Documents section under Privacy has a broken icon (just a rectangle), and another in which the update process hangs for extended periods of time when attempting to install a new build.

(Get more info about Insider Preview Build 19564.)

Windows 10 Insider Preview Build 19559

Release date: February 5, 2020

Released to: Fast ring

This minor build has only small bug fixes, including for one that resulted in explorer.exe crashing when backing out of folders containing .heic or RAW files, and another that caused some people to get a green screen with the error message KMODE EXCEPTION NOT HANDLED.

There are 10 known issues in this build, including one in which the Documents section under Privacy has a broken icon (just a rectangle), and another in which some devices are no longer sleeping on idle.

(Get more info about Insider Preview Build 19559.)

Windows 10 Insider Preview Build 19555

Release date: January 30, 2020

Released to: Fast ring

This minor build has only small bug fixes, including for one in which when certain external USB 3.0 drives are attached, they stopped responding with Start Code 10, and another that resulted in the Start menu and apps not opening until explorer.exe had been restarted after locking and then unlocking a computer while listening to music.

There are eight known issues in this build, including one in which the Documents section under Privacy has a broken icon and another in which some devices are no longer sleeping on idle.

(Get more info about Insider Preview Build 19555.)

Windows 10 Insider Preview Build 19551

Release date: January 23, 2020

Released to: Fast ring

This minor build has only small bug fixes, including for one in which snipping was not working on secondary monitors, one in which Remote Desktop Connection was crashing when attempting to connect to multiple sessions, and another in which the Optimize Drives Control Panel was incorrectly showing that optimization hadn’t run on some devices.

There are nine known issues in this build, including one in which when certain external USB 3.0 drives are attached, they stop responding with Start Code 10, and another in which the Documents section under Privacy has a broken icon (just a rectangle).

(Get more info about Insider Preview Build 19551.)

Windows 10 Insider Preview Build 19546

Release date: January 16, 2020

Released to: Fast ring

This build introduces graphing mode for Windows Calculator. Previously, the calculator didn’t have the ability to create graphs. Graphing mode allows one or more equations to be plotted on a graph, lets you add equations with secondary variables, and allows you to analyze graphs.

There are also four minor bug fixes in the build, including for a bug that had resulted in Timeline not showing any activities, and another in which Outlook wasn’t working for some people.

There are nearly a dozen known issues in this build, including one in which when certain external USB 3.0 drives are attached, they stop responding with Start Code 10, and another in which Remote Desktop Connection crashes when attempting to connect to multiple sessions.

(Get more info about Insider Preview Build 19546.)

Windows 10 Insider Preview Build 19541

Release date: January 8, 2020

Released to: Fast ring

This build lets you set timers with Cortana and adds Bing’s Instant Answers capabilities to Cortana; for instance, you can ask when Seattle’s Space Needle was built and receive an answer instantly in Cortana without being taken to a web search. In addition, an icon now appears in the Notification Area when an app is using your location.

The build also fixes a number of problems, including one that made Systems Settings less reliable and another that could cause the update speed in Task Manager to unexpectedly be set to Paused.

There are nine known issues in this build, including one in which when certain external USB 3.0 drives are attached, they stop responding with Start Code 10, and another that doesn’t allow Timeline to show any activities.

(Get more info about Insider Preview Build 19541.)

Windows 10 Insider Preview Build 19536

Release date: December 16, 2019

Released to: Fast ring

This build lets those with Android phones see all of their phone’s pictures on their Windows 10 PCs. You can now also more easily find new hardware drivers and update them. Instead of having to go the Device Manager, you can ask Windows Update to keep your drivers up to date.

The build also introduces a consumer-oriented feature called “People in my family” that makes it easier to set up devices that can be used by multiple family members. Not everyone who gets the build will have the feature enabled.

The build also offers a variety of bug fixes, changes and improvements. It fixed an issue that resulted in Task Manager’s icon not appearing in the notification area of the taskbar even though if it had been enabled in Settings. In addition, an issue was fixed that caused the Bluetooth battery level displayed in Settings to get stuck, reducing its accuracy.

There are five known issues in this build, including one in which when certain external USB 3.0 drives are attached, they stop responding with Start Code 10.

(Get more info about Insider Preview Build 19536.)

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