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Release Date:

2/2/2021

Version:

2004-OS Build 19041.789 and 20H2-OS Build 19042.789

Important:  12/8/20
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11/17/20

For information about Windows update terminology, see the article about the types of Windows updates and the monthly quality update types. To view other notes and messages, see the Windows 10, version 2004  update history home page.
Note Follow @WindowsUpdate to find out when new content is published to the release information dashboard. 

 Highlights

  • Updates an issue that causes a device to stop responding when you play a game in full-screen or tablet mode.  

  • Updates an issue with using Ctrl+Caps Lock and Alt+Caps Lock to switch to Hiragana or Katakana mode respectively after upgrading to Windows 10, version 2004.

  • Updates an issue that prevents you from opening a document that is on the Windows desktop.

  • Updates an issue that creates duplicate cloud provider folders in the File Explorer navigation pane.

  • Updates an issue with some special key combinations used in DaYi, Yi, and Array IMEs that might cause an application to stop working.

  • Updates an issue that displays a blank lock screen after a device wakes up from Hibernate.

  • Corrects historical daylight savings time (DST) information for the Palestinian Authority.

  • Updates an issue that incorrectly deactivates some Windows 10 Education devices after upgrading to Windows 10, version 2004.

  • Updates an issue that might cause the Alt+Tab order to change unexpectedly and cause you to switch to the wrong window.

  • Updates an issue that fails to show Extract all on the shortcut menu when you right-click an online-only ZIP file.

Improvements and fixes

Note: To view the list of KB articles, click or tap the OS name to expand the collapsible section.

This non-security update includes quality improvements. Key changes include:

  • This build includes all the improvements from Windows 10, version 2004.

  • Addresses an issue that might cause the Alt+Tab order to change unexpectedly and cause you to switch to the wrong window.

This non-security update includes quality improvements. Key changes include:

  • Updates the default values for the following Internet Explorer registry keys:

    • svcKBFWLink = “ ” (empty string)

    • svcKBNumber = “ ” (empty string)

    • svcUpdateVersion = 11.0.1000.

    In addition, these values will no longer be updated automatically. 

  • Enables administrators to disable standalone Internet Explorer using a Group Policy while continuing to use Microsoft Edge's IE Mode.

  • Enables you to configure certain policies that support Microsoft Edge IE Mode using mobile device management (MDM).

  • Addresses an issue in the Universal C Run-time Library (UCRT) that causes printf() to incorrectly round floating point values.

  • Addresses an issue that displays a User Account Control (UAC) dialog box unexpectedly when you turn on speech recognition.

  • Addresses an issue that fails to notify the target application when you select the Copy link command on the Share menu.

  • Addresses an issue that causes the 64-bit fmod() and remainder() functions to damage the Floating Point Unit (FPU) stack.

  • Addresses an issue that causes a stop error or causes a device to stop responding when you play a game in full-screen or tablet mode.

  • Addresses an issue with using Ctrl+Caps Lock and Alt+Caps Lock to switch to Hiragana or Katakana mode respectively after upgrading to Windows 10, version 2004.

  • Addresses an issue that prevents you from opening a document that is on the Windows desktop and generates the error, “The directory name is invalid.” This issue occurs after changing the desktop location in the Location tab of the Desktop Properties dialog box (File Explorer > This PC > Desktop).

  • Addresses an issue that creates duplicate cloud provider folders in the File Explorer navigation pane.

  • Addresses an issue that occurs when the Mandatory Profile check box is selected when you copy a user profile.

  • Addresses an issue that prevents ImmGetCompositionString() from returning the white space for furigana when using the Japanese Input Method Editor (IME).

  • Addresses an issue with some special key combinations used in DaYi, Yi, and Array IMEs that might cause an application to stop working.

  • Addresses an issue that displays a blank lock screen after a device wakes up from Hibernate.

  • Corrects historical daylight savings time (DST) information for the Palestinian Authority.

  • Adds support for serial number control using the registry.

  • Addresses an issue that incorrectly deactivates some Windows 10 Education devices after upgrading to Windows 10, version 2004.

  • Addresses an issue that causes the upload of diagnostic logs to a management service, such as Microsoft Intune, to fail. The failure occurs because of a network time-out on a slow network.

  • Displays a notification to a user when an administrator signs in to an MDM service, such as Microsoft Intune, to find the location of a managed device.

  • Addresses an issue that prevents users from using their smart card credentials when the user hint is the domain credential name (domain\username).

  • Addresses an issue in which using local Service for User (S4U) affects Data Protection API (DPAPI) credential keys and causes users to sign out unexpectedly.

  • Addresses an issue that causes the silent mode deployment of BitLocker to fail with the error 0x80310001. This issue occurs when deploying BitLocker encryption to Hybrid Azure Active Directory (Azure AD) joined devices.

  • Addresses an issue that might cause systems that use BitLocker to stop working with the error 0x120 (BITLOCKER_FATAL_ERROR).

  • Addresses an issue that causes a device to stop working when deploying Microsoft Endpoint Configuration Manager if AppLocker is enabled on the device.

  • Addresses an issue that cause the LSASS.exe process to leak memory on a server that is under a heavy authentication load when Kerberos Armoring (Flexible Authentication Secure Tunneling (FAST)) is enabled.

  • Addresses an issue that causes LSASS.exe to stop working because of a race condition that results in a double free error in Schannel. The exception code is c0000374, and the Event Log displays Schannel event 36888, fatal error code 20, and error state 960. This issue occurs after installing Windows updates from September 2020 and later.

  • Addresses a memory leak issue that occurs when you authenticate a client certificate on servers that are configured as domain controllers.

  • Addresses an issue with Virtual Interrupt Notification Assert (VINA) interrupts.

  • Addresses an issue with HTTP caching that interferes with kiosk mode that targets Azure AD groups.

  • Addresses an issue that occurs when a Volume Shadow Copy Service (VSS) snapshot triggers on virtual machines (VM) that contain Resilient File System (ReFS) volumes. The triggered VSS snapshot fails with a time-out and prevents access to the ReFS volume for 30 minutes.

  • Addresses an issue that incorrectly logs Extensible Storage Engine Technology (ESENT) event 642 in the Application Event Log.

  • Addresses an issue with Administrative Template settings you configure using a Group Policy Object (GPO). When you change the value of the policy settings to NOT CONFIGURED, the system continues to apply the previous settings instead of removing them. This issue occurs after installing the June 2020 or later updates and is most noticeable with roaming user profiles.

  • Addresses an issue that might cause a deadlock in Windows Virtual Desktop when a user disconnects before a driver fully loads.

  • Addresses an issue that fails to show Extract all on the shortcut menu when you right-click an online-only ZIP file.

  • Updates the process for enrolling in online speech recognition. If you are already enrolled, you will see a message that asks you to review the new settings. If you choose not to contribute your speech data for human review, you can still use online speech recognition. The new settings contain one button to turn on online speech recognition and another button that turns on the collection of your voice clips. If you turn on the collection of your voice clips, you can turn it off at any time using the same button in the new settings page.

  • Addresses an issue that prevents the Start menu, Cortana, and tiles pinned to the Taskbar from opening. This issue occurs when an administrator copies an existing profile that has the Mandatory Profile check box selected. 

  • Addresses an issue that causes Windows Group Policy and the User-mode Power Service to deadlock. As a result, the system might stop responding when you sign in, sign out, or at other times.

  • Addresses an issue that causes an increase in network traffic during update detection for Windows Updates. This issue occurs on devices that are configured to use an authenticated user proxy as the fallback method if update detection with a system proxy fails or there is no proxy.

If you installed earlier updates, only the new fixes contained in this package will be downloaded and installed on your device.

Windows Update Improvements

Microsoft has released an update directly to the Windows Update client to improve reliability. Any device running Windows 10 configured to receive updates automatically from Windows Update, including Enterprise and Pro editions, will be offered the latest Windows 10 feature update based on device compatibility and Windows Update for Business deferral policy. This doesn't apply to long-term servicing editions.

Known issues in this update

Symptoms

Workaround

When using the Microsoft Japanese Input Method Editor (IME) to enter Kanji characters in an app that automatically allows the input of Furigana characters, you might not get the correct Furigana characters. You might need to enter the Furigana characters manually.

Note The affected apps are using the ImmGetCompositionString() function.

This issue is resolved in KB5005101.

Microsoft and Discord have found incompatibility issues with some games using Direct3D 12 when the in-game overlay feature of Discord is enabled. When attempting to open affected games you might receive an error, or the game might close silently.

To mitigate this issue, you can turn off the in-game overlay in settings within the Discord app.

This issue is now resolved in an update to the Discord app. To verify you're on the latest version, right click on the Discord icon in the notification area and select "Check for updates...". If there are updates to install, it should install automatically but you might need to select the arrow icon in the upper right corner of the app to install the updated version. There is no update for Windows needed to resolve this issue.

How to get this update

Before installing this update

Microsoft strongly recommends you install the latest servicing stack update (SSU) for your operating system before installing the latest cumulative update (LCU). SSUs improve the reliability of the update process to mitigate potential issues while installing the LCU. For general information about SSUs, see Servicing stack updates and Servicing Stack Updates (SSU): Frequently Asked Questions.

If you are using Windows Update, the latest SSU (KB4598481) will be offered to you automatically. To get the standalone package for the latest SSU, search for it in the Microsoft Update Catalog.

Install this update

Release Channel

Available

Next Step

Windows Update or Microsoft Update

Yes

Go to Settings Update & Security > Windows Update. In the Optional updates available area, you’ll find the link to download and install the update.

Microsoft Update Catalog

Yes

To get the standalone package for this update, go to the Microsoft Update Catalog website.

Windows Server Update Services (WSUS)

No

You can import this update into WSUS manually. See the Microsoft Update Catalog for instructions.

File information

For a list of the files that are provided in this update, download the file information for cumulative update 4598291

Note Some files erroneously have “Not applicable” in the “File version” column of the CSV file. This might lead to false positives or false negatives when using some third-party scan detection tools to validate the build.

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