Microsoft Software Updates

Windows 10: A guide to the updates

Here's what you need to know about each update to the current version of Windows 10 as it's released from Microsoft. Now updated for KB5017380 Preview, released on Sept. 20, 2022.

Microsoft Software Updates

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Updates to Windows 10 version 2004 prior to the 20H2 release

KB4579311 (OS Build 19041.572)

Release date: October 13, 2020

This build fixes a few minor bugs and includes a variety of security updates. Among the bugs 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.

There are two known issues in this build: In one, users of Microsoft Input Method Editor (IME) for Chinese and Japanese might have issues with input. In the other, when installing a third-party driver you might receive the error “Windows can’t verify the publisher of this driver software.” You might also see the error “No signature was present in the subject” when attempting to view the signature properties using Windows Explorer.

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 KB4579311.)

KB4577063 (OS Build 19041.546) Preview

Release date: October 1, 2020

This build reduces distortions and aberrations in Windows Mixed Reality head-mounted displays and fixes a wide variety of bugs, including one that caused random line breaks when you redirect PowerShell console error output, and another that that prevented the Language Bar from appearing when a user signs in to a new session.

There is one known issue in this build: Users of Microsoft Input Method Editor (IME) for Chinese and Japanese might have issues with input.

(Get more info about KB4577063.)

KB4571756 (OS Build 19041.508)

Release date: September 8, 2020

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.

There is one known issue in this build: Users of Microsoft Input Method Editor (IME) for Chinese and Japanese might have issues with input.

(Get more info about KB4571756.)

KB4571744 (OS Build 19041.488)

Release date: September 3, 2020

This build fixes a laundry list of minor bugs, including one that prevented apps from downloading an update or opening in certain scenarios, another that prevented users from reducing the size of windows and another that caused File Explorer to stop working when you browsed directories of RAW images and other file types.

There is one known issue in this build: Users of Microsoft Input Method Editor (IME) for Chinese and Japanese might have issues with input.

(Get more info about KB4571744.)

KB4566782 (OS Build 19041.450)

Release date: August 11, 2020

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.

There is one known issue in this build: When using some apps, such as Microsoft Excel, users of the Microsoft Input Method Editor (IME) for Chinese and Japanese might receive an error, or the app might stop responding or close when attempting to drag using the mouse.

(Get more info about KB4566782.)

KB4568831 (OS Build 19041.423)

Release date: July 31, 2020

This minor build addresses a wide variety of bugs and issues, including one that caused the Settings page to close unexpectedly, which prevented default applications from being set up properly, and another that prevented some applications from printing to network printers.

There is one known issue in this build, in which when using some apps such as Excel, users of the Microsoft Input Method Editor (IME) for Chinese and Japanese might receive an error, or the app might stop responding or close when users attempt to drag using the mouse.

(Get more info about KB4568831.)

KB4565503 (OS Build 19041.388)

Release date: July 14, 2020

This build fixes several bugs, including one that might prevent you from connecting to OneDrive using the OneDrive app. It also has security updates for the 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 the Release notes for the July 2020 Security Updates.

There is one known issue in this build, in which when using some apps, such as Microsoft Excel, users of the Microsoft Input Method Editor (IME) for Chinese and Japanese might receive an error, or the app might stop responding or close when attempting to drag using the mouse.

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 KB4565503.)

KB4567523 (OS Build 19041.331)

Release date: June 18, 2020

This minor build fixes a single issue, in which certain printers could not print, generated print errors, or caused apps and print spoolers to close unexpectedly.

There is one known issue in this build, which affects the ImeMode property to control the Input Method Editor (IME) mode for individual text entry fields to increase typing efficiency. Some IMEs in this build might have issues using the ImeMode property with certain apps, for example the input mode will not switch automatically to Kanji or Hiragana.

(Get more info about KB4567523.)

KB4557957 (OS Build 19041.329)

Release date: June 9, 2020

This build improves the reliability of voice assistants that use keywords and has security updates for the Microsoft Scripting Engine, Microsoft Edge, Internet Explorer, Windows App Platform and Frameworks, Windows Media, Windows Kernel, Microsoft Graphics Component, Windows Input and Composition, Windows Shell, Windows Silicon Platform, Microsoft Xbox, the Microsoft Store, Windows Cloud Infrastructure, Windows Fundamentals, Windows Management, Windows Authentication, Windows Cryptography, Microsoft HoloLens, Windows Virtualization, Windows Peripherals, Windows Storage and Filesystems, Windows File Server and Clustering, Windows Hybrid Storage Services, the Microsoft JET Database Engine, and the Windows Update Stack. For details, see the Release Notes for June 2020 Security Updates.

There are no known issues in this build.

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 KB4557957.)

Windows 10 May 2020 Update (version 2004)

Release date: May 27, 2020

Version 2004, called the Windows 10 May 2020 Update, is the most recent update to Windows 10. This is a relatively minor update but does have a variety of new features for both users and system administrators. For more details, see: “Review: Windows 10 May 2020 Update delivers little tweaks that add up to... well, not a lot.”

Here’s a quick summary of what’s new in 2004:

  • Cortana now runs as a standalone app in a resizable window. It also loses a variety of capabilities, such as playing music, controlling home devices, and working on the lock screen.
  • Task Manager now displays new information, including the temperature of your GPU and your disk type.
  • Settings gets many small tweaks, including adding a header with account information, and a redone network status page that combines information that used to be found on multiple pages, such as your IP address, current connection properties and data usage.
  • The Windows Subsystem for Linux (WSL) gets more features. It now uses a real Linux kernel, and is faster than previously.
  • IT can now take advantage of Windows Hello biometrics logins rather than passwords, by setting that up as the default on enterprise devices.
  • Installing and setting up Windows for others has been made easier thanks to new controls added to Dynamic Update, which can lead to less downtime during installation for users.
  • A variety of new commands have been given to PowerShell for Delivery Optimization, a Windows networking service that reduces bandwidth consumption by sharing the work of downloading update and upgrade packages among multiple devices in business deployments.
  • The security of the Chromium version of Edge has been improved, thanks to porting Application Guard to it.

Updates to the November 2019 Update (version 1909)

KB4556799 (OS Build 18363.836)

Release date: May 12, 2020

This build updates the 2020 start date for daylight saving time (DST) in the Kingdom of Morocco, and has security updates for Internet Explorer, the Microsoft Scripting Engine, Windows App Platform and Frameworks, Microsoft Graphics Component, Windows Input and Composition, Windows Media, Windows Shell, Microsoft Xbox, Microsoft Edge, Windows Fundamentals, Windows Cryptography, Windows Authentication, Windows Kernel, Windows Linux, Windows Update Stack, Windows Network Security and Containers, Windows Active Directory, Windows Storage and Filesystems, and the Microsoft JET Database Engine. For details, see the Release Notes for May 2020 Security Updates.

There are no known issues in this build.

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 KB4556799.)

KB4550945 (OS Build 18363.815)

Release date: April 21, 2020

This update fixes a variety of small bugs, including one that turned off notifications for devices that use a VPN on a cellular network, and another that generated unexpected notifications when you change the default application settings.

(Get more info about KB4550945.)

KB4549951 (OS Build 18363.778)

Release date: April 14, 2020

This security update fixes a variety of security holes in Windows 10, including for Microsoft Edge, Internet Explorer, and a Win32k Information Disclosure Vulnerability. For more details, see the April 2020 Security Update Release Notes.

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 KB4549951.)

KB4554364 (OS Build 18363.753)

Release date: March 30, 2020

This optional update fixes a bug that could cause Windows to display a limited or no internet connection status in the notification area on devices that use a manual or auto-configured proxy, especially with a virtual private network (VPN). The bug also could prevent some devices from connecting to the internet using applications that use WinHTTP or WinINet.

Note: Microsoft recommends that the update be applied only to devices that are affected by the bug.

There are no known issues in the update.

(Get more info about KB4554364.)

KB4541335 (OS Build 18363.752)

Release date: March 24, 2020

This minor update fixes half-a-dozen small bugs, including one that caused an error when printing to a document share, and another that prevented applications from closing. There are no known issues in the update.

(Get more info about KB4541335).

KB4551762 (OS Build 18363.720)

Release date: March 12, 2020

This security-only update has a patch for Microsoft Server Message Block 3.1.1 (SMBv3), a network communication protocol issue that provides shared access to files, printers, and serial ports. For details, see the March 2020 Security Updates Release Notes.

There is one known issue with the update: when using Windows Server containers, you might encounter problems with 32-bit applications and processes.

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 KB4551762.)

KB4540673 (OS Build 18363.719)

Release date: March 10, 2020

This build fixes one small bug and plugs a series of security holes. It fixes an issue that prevented some users from upgrading Windows 10 because of corrupted third-party assemblies.

The update also has security patches Windows App Platform and Frameworks, Windows Media, Windows Silicon Platform, Microsoft Edge, Internet Explorer, Windows Fundamentals, Windows Authentication, Windows Peripherals, Windows Update Stack, and Windows Server. For details, see the March 2020 Security Updates Release Notes.

There is one known issue with the update, in which when using Windows Server containers, you might encounter problems with 32-bit applications and processes.

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 KB4540673.)

KB4535996 (OS Build 18363.693)

Release date: February 27, 2020

This build fixes a wide variety of minor bugs, including one that prevented some applications from printing to network printers, and another that caused Microsoft Narrator to stop working when a user session is longer than 30 minutes.

(Get more info about KB4535996.)

KB4532693 (OS Build 18363.657)

Release date: February 11, 2020

This Patch Tuesday build fixes two small bugs and plugs a series of security holes. It fixes problems people experienced when migrating cloud printers during an upgrade and improves the installation experience when updating to Windows 10, version 1903.

The update also has security patches for Internet Explorer, Microsoft Edge, Windows Fundamentals, Windows Cryptography, Windows Virtualization, Windows Network Security and Containers, Windows Server, Windows Management, Microsoft Graphics Component, Windows Input and Composition, Windows Media, the Microsoft Scripting Engine, and Windows Shell. For details, see the February 2020 Security Updates Release Notes.

There are no known issues with the update.

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 KB4532693.)

KB4532695 (OS Build 18363.628)

Release date: January 28, 2020

This build improves the accuracy of Windows Hello face authentication and fixes a variety of small bugs, including one that caused a gray box to appear when you searched within Control Panel and File Explorer, another that prevented File Explorer's Quick Access control from pasting clipboard content using the right mouse button, and another that caused the touch keyboard to close when you selected any key. There are no known issues with the update.

(Get more info about KB4532695.)

KB4528760 (OS Build 18363.592)

Release date: January 14, 2020

This build has security updates for Windows App Platform and Frameworks, Windows Input and Composition, Windows Management, Windows Cryptography, Windows Storage and Filesystems, the Microsoft Scripting Engine, and Windows Server. For details, see the January 2020 Security Updates Release Notes. It also has updates for Microsoft HoloLens (OS Build 18362.1044).

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 KB4528760.)

KB4530684 (OS Build 18363.535)

Release date: December 10, 2019

This minor update fixes two minor issues — one that might cause error 0x3B in cldflt.sys on some devices, and another that might prevent you from creating a local user account using the Input Method Editor (IME) for Chinese, Japanese, or Korean languages when setting up a new Windows device during the Out of Box Experience (OOBE).

The update also has security patches for Windows Virtualization, Windows Kernel, the Microsoft Scripting Engine, and Windows Server. For details, see the December 2019 Security Updates Release Notes.

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 KB4530684.)

KB4524570 (OS Build 18363.476)

Release date: November 12, 2019

This update fixes security issues in Windows, Internet Explorer and Microsoft Edge (EdgeHTML-based). For details, see Microsoft’s November 2019 Security Update notes.  

There is one known issue in this update, in which you may not be able to create a local user when setting up a new Windows device during the Out of Box Experience (OOBE) while using Input Method Editor (IME). This issue might affect you if you are using the IME for Chinese, Japanese, or Korean languages. 

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 KB4524570.)

Windows 10 November 2019 Update (version 1909)

Release date: Nov. 12, 2019

Version 1909, called the Windows 10 November 2019 Update, is the most recent update to Windows 10. There are very few new features in this update, making it more like a service pack of old than a feature update. At this point it’s not clear whether in the future there will be one full-featured update and one service-pack-like update per year or whether Microsoft will go back to its two-feature-updates-a-year schedule. For more details, see “What we know so far about the unusual Windows 10 1909” and “5 unanswered questions about Windows 10 1909.”

Here’s a quick summary of what’s new for users in 1909.

  • It lets you create calendar events straight from the taskbar. To do it, click the time on the taskbar and you’ll open the Calendar view. Now click a date and time, then type the event’s name into the text box. You’ll also be able to choose the date, time and location.
  • When you type a search into the search box, it will now search through files in your OneDrive account as well as on your PC. Also, as you type, a drop-down menu with suggested files appears. Click a file to open it.
  • Voice assistants in addition to Cortana, including Amazon’s Alexa, will be able to run on Windows 10’s lock screen.
  • Under-the-hood improvements should speed up the performance of some PCs, as well as increase the battery life in some laptops.
  • The Start Menu has gotten minor tweaks. When you hover over items in the navigation pane on the left side of the menu, the items clearly show what you’re about to click.

What IT needs to know: The following features in 1909 are of note for IT staff.

  • Windows containers no longer need to have their host and container versions match. That requirement restricted Windows from supporting mixed-version container pod scenarios. Previously, containers from older versions of Windows 10 couldn’t be run on newer versions of Windows 10. In this update, it’s possible, so that a container made using 1903, for example, can be run on 1909.
  • Windows Defender Credential Guard, which protects enterprise users’ logins and credentials against theft, is now available for ARM64 devices. Some Windows 10 convertible PCs use ARM64.
  • Enterprises can now use Microsoft’s Intune enterprise mobility management (EMM) service to allow devices running Windows 10 in S mode to install and run Win32 (desktop) apps. Before this, S Mode only allowed devices to run apps from the Microsoft Store. Microsoft Store apps don’t run on the desktop.
  • The security of BitLocker encryption has been improved. Whenever BitLocker is used to encrypt a device, a recovery key is created, but before this security improvement, it was possible for an unauthorized user to get access to the recovery key and decrypt the device. Now, PCs have additional security if a key is exposed. Here’s how Microsoft explains the change: “Key-rolling or Key-rotation feature enables secure rolling of Recovery passwords on MDM managed AAD devices upon on demand request from Microsoft Intune/MDM tools or upon every time recovery password is used to unlock the BitLocker protected drive.”

Updates to the May 2019 Update (version 1903)

Note: Starting in November 2019, Microsoft began issuing identical updates for Windows 10 versions 1903 and 1909. The updates above under "Windows 10 November 2019 Update (version 1909)" are the same as those delivered to version 1903.

KB4522355 (OS Build 18362.449)

Release date: October 24, 2019

This update fixes a wide variety of minor bugs, including one that prevented Microsoft Narrator from working in certain touch mode scenarios; another that prevented windows from being shrunk in some cases; and another that caused the Start menu, the Cortana Search bar, Tray icons, or Microsoft Edge to stop responding in certain scenarios after installing a monthly update.

There are no known issues in this update.

(Get more info about KB4522355.)

KB4517389 (OS Build 18362.418)

Release date: October 8, 2019

This update fixes a variety of security issues in Windows Shell, Internet Explorer, Microsoft Edge, Windows App Platform and Frameworks, Windows Cryptography, Windows Authentication, Windows Storage and Filesystems, Windows Kernel, Microsoft Scripting Engine, and Windows Server. For details, see Microsoft’s Security Update Guide. It also addresses an issue in security bulletin CVE-2019-1318 that may cause client or server computers that don’t support Extended Master Secret (EMS) RFC 7627 to have increased connection latency and CPU utilization. In addition, it fixes an issue with applications and printer drivers that utilize the Windows JavaScript engine (jscript.dll) for processing print jobs.

There are no known issues in this update.

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 KB4517389.)

KB4524147 (OS Build 18362.388)

Release date: October 3, 2019

This security update protects against the Internet Explorer scripting engine security vulnerability (CVE-2019-1367) and also fixes an issue with the print spooler service that has caused some print jobs to fail.

It doesn’t replace the upcoming October 2019 monthly update, scheduled to be available on October 8.

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 KB4524147.)

KB4517211 (OS Build 18362.387)

Release date: September 26, 2019

This minor build fixes a wide variety of small bugs, including an issue that caused some devices to disconnect from a virtual private network (VPN) on cellular networks, and another that prevented older systems from upgrading to the latest operating systems because a display driver error.

There is one known issue in this build, in which the Input Method Editor (IME) may become unresponsive or may have high CPU usage.

(Get more info about KB4517211.)

KB4522016 (OS Build 18362.357)

Release date: September 23, 2019

This security update fixes a zero-day vulnerability in Internet Explorer, a Scripting Engine Memory Corruption Vulnerability that could allow someone to introduce malicious code into a browser. For details, see Microsoft’s security vulnerability information.

There are two known issues in this update, one in which the audio for certain games is quieter or different than expected, and another in which the Input Method Editor (IME) may become unresponsive or may have high CPU usage.

What IT needs to know: Because of the severity of the vulnerability and the fact that criminals are already exploiting it, Microsoft recommends installing the patch right away.

(Get more info about KB4522016.)

KB4515384 (OS Build 18362.356)

Release date: September 10, 2019

This is primarily a security update. One set of security updates protects against a new subclass of speculative execution side-channel vulnerabilities, known as Microarchitectural Data Sampling, for 32-bit (x86) versions of Windows. To take advantage of the fix, use the Registry settings described in these Windows client and Windows Server guidance articles.

In addition, there are security updates for Microsoft Edge, Internet Explorer, Microsoft Scripting Engine, Windows App Platform and Frameworks, Windows Input and Composition, Windows Media, Windows Fundamentals, Windows Authentication, Windows Cryptography, Windows Datacenter Networking, Windows Storage and Filesystems, Windows Wireless Networking, the Microsoft JET Database Engine, Windows Kernel, Windows Virtualization, and Windows Server. For more details, go to the September 2019 Security Update notes.

This build also ostensibly fixes a bug that causes high CPU usage from SearchUI.exe on devices that have disabled searching the web using Windows Desktop Search. However, Microsoft has confirmed that some users are experiencing similar problems with Search after installing the new build.

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 KB4515384.)

KB4512941 (OS Build 18362.329)

Release date: August 30, 2019

This update fixes a wide variety of minor bugs, including an issue that prevented Windows Defender Advanced Threat Protection (ATP) from running automated forensic data collection when using registry-based proxy configuration, and another that displayed a black screen when Remote Desktop was used to connect to a machine running Windows 10, version 1903.

There is one known issue in this build: On devices that have disabled web search via Windows Desktop Search, search may not return any results and may have high CPU usage.

(Get more info about KB4512941.)

KB4512508 (OS Build 18362.295)

Release date: August 13, 2019

This update fixes an issue that may prevent devices from starting up or cause them to continue restarting if they are connected to a domain that is configured to use MIT Kerberos realms.

In addition, there are security updates to Windows App Platform and Frameworks, Windows Storage and Filesystems, Microsoft Scripting Engine, Windows Input and Composition, Windows Wireless Networking, Windows Cryptography, Windows Datacenter Networking, Windows Virtualization, Windows Storage and Filesystems, the Microsoft JET Database Engine, Windows Linux, Windows Kernel, Windows Server, Windows MSXML, Internet Explorer, and Microsoft Edge. For more details, go to the August 2019 Security Update notes.

There are two known issues in this build, including one in which Windows Sandbox may fail to start with "ERROR_FILE_NOT_FOUND (0x80070002)" on devices in which the operating system language is changed during the update process when installing Windows 10, version 1903, and another in which devices that start up using Preboot Execution Environment (PXE) images from Windows Deployment Services (WDS) or System Center Configuration Manager (SCCM) may fail to start with the error "Status: 0xc0000001, Info: A required device isn't connected or can't be accessed" after installing this update on a WDS server.

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 KB4512508.)

KB4505903 (OS Build 18362.267)

Release date: July 26, 2019

This build has more than three dozen bug fixes, including for an issue that prevented Windows Hello face recognition from working after a restart, another that prevented some people from changing the display brightness after their devices resumed from Sleep or Hibernation, another that reduced Bluetooth audio quality when certain audio profiles were used for extended periods, and another that caused a mouse press and release to sometimes produce an extra mouse movement.

There are several known issues in this build, including one in which Windows Sandbox may fail to start with "ERROR_FILE_NOT_FOUND (0x80070002)" on devices in which the operating system language is changed during the update process when installing Windows 10, version 1903, and another in which devices connected to a domain that is configured to use MIT Kerberos realms may not start up or may continue to restart. Devices that are domain controllers or domain members are both affected.

(Get more info about KB4505903.)

KB4507453 (OS Build 18362.239)

Release date: July 9, 2019

This build fixes several minor bugs, including one in which BitLocker would go into recovery mode when it was being provisioned at the same time updates were being installed, and another in which Mixed Reality users saw a tilted world after connecting their headsets.

Also included are security updates to Windows Wireless Networking, Microsoft Scripting Engine, Windows Server, Windows Storage and Filesystems, Windows Kernel, Microsoft HoloLens, Internet Explorer, Windows Input and Composition, Windows Virtualization, Windows App Platform and Frameworks, Microsoft Graphics Component, Microsoft Edge, and Windows Cryptography. For details, go to the July 2019 Security Update notes.

There are several known issues in this build, including one in which opening or using the Window-Eyes screen reader app may result in an error and some features may not function as expected, and another in which Windows Sandbox may fail to start with "ERROR_FILE_NOT_FOUND (0x80070002)" on devices in which the operating system language is changed during the update process when installing Windows 10, version 1903.

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 KB4507453.)

KB4501375 (OS Build 18362.207)

Release date: June 27, 2019

This build fixes a variety of minor bugs, including one in which the cursor didn’t display when it was hovered over the keyboard magnifier, and another that caused Office 365 applications to stop working after opening when they were deployed as App-V packages.

There is one known issue in the build, in which Windows Sandbox may fail to start with "ERROR_FILE_NOT_FOUND (0x80070002)" on devices in which the operating system language is changed during the update process when installing Windows 10, version 1903.

(Get more info about KB4501375.)

KB4503293 (OS Build 18362.175)

Release date: June 11, 2019

This build addresses only security issues. In one, the build prevents connections between Windows and Bluetooth devices that are not secure and use well-known keys to encrypt connections, including security fobs. You’ll have to contact the manufacturer of your Bluetooth device to see if there’s a software update for it. For more details, see CVE-2019-2102 and KB4507623.

Also included are security updates to Windows Virtualization, Microsoft Scripting Engine, Internet Explorer, Windows App Platform and Frameworks, Windows Input and Composition, Windows Media, Windows Shell, Windows Server, Windows Authentication, Windows Cryptography, Windows Storage and Filesystems, Windows SQL Components, the Microsoft JET Database Engine, and Internet Information Services. For details, go to the June 2019 Security Update notes.

There is one known issue in the build, in which Windows Sandbox may fail to start with "ERROR_FILE_NOT_FOUND (0x80070002)" on devices in which the operating system language is changed during the update process when installing Windows 10, version 1903.

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 KB4503293.)

KB4497935 (OS Build 18362.145)

Release date: May 29, 2019

This build addresses two dozen minor bugs in the just-released version of Windows 10, including one in which a File Share Witness does not remove Server Message Block (SMB) handles, which causes a server to eventually stop accepting SMB connections, and another in which Night light mode may be turned off during display mode changes.

There are two known issues in the build, including one in which Windows Sandbox may fail to start with "ERROR_FILE_NOT_FOUND (0x80070002)" on devices in which the operating system language is changed during the update process when installing Windows 10, version 1903.

(Get more info about KB4497935.)

Windows 10 May 2019 Update (version 1903)

Release date: May 21, 2019

Version 1903, called the Windows 10 May 2019 Update, is the feature update that preceded the November 2019 Update. Here’s a quick summary of what’s new for users in it. (For more details, see our full review.)

  • Windows 10 Home and Pro users can now control whether to install the twice-yearly feature updates like the Windows 10 May 2019 Update via a new “Download and install now” option. However, when users’ current version of Windows reaches what Microsoft calls “end of service” — the point at which Microsoft no longer supports it — Windows 10 will install the latest feature update automatically. End of service is typically 18 months after a Windows 10 feature update is released.
  • Windows 10 users can pause any minor Windows updates that Microsoft issues in between the big feature updates for up to 35 days.
  • Cortana and the search box have been separated. To perform a Cortana search, you can say “Hey Cortana” and speak your search, click the Cortana icon to the right of the search box and speak, or press the Windows key + C and speak. All other searches are done by Windows Search.
  • You can now use search to find files in any location on your PC, not just in default libraries and folders like OneDrive, Documents, Downloads, Music, Pictures, Videos, and Desktop. However, that requires indexing, which reduces laptop battery life and could slow down PC performance.
  • You can uninstall more built-in apps than previously, including 3D Viewer (previously called Mixed Reality Viewer), Calculator, Calendar, Groove Music, Mail, Movies & TV, Paint 3D, Snip & Sketch, Sticky Notes, and Voice Recorder.

What IT needs to know: The Professional and Enterprise versions of Windows 10 get a new security tool called Windows Sandbox. It lets you test out software and websites in their own containers, so that if they’re dangerous, they can’t get to Windows 10 itself. Close the sandbox, and the software or website vanishes.

IT administrators can also extend the safety features of Windows Defender Application Guard beyond Edge via browser extensions for Chrome and Firefox and an app from the Microsoft store. When users browse to an untrusted site in Chrome or Firefox, the site will open in Edge, inside a virtual machine using Windows Defender Application Guard.

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7 inconvenient truths about the hybrid work trend
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