March 25, 2021—KB5000850 (OS Build 18363.1474) Preview

^2/16/21 IMPORTANT As part of the end of support for Adobe Flash, KB4577586 is now available as an optional update from Windows Update (WU) and Windows Server Update Services (WSUS). Installing KB4577586 will remove Adobe Flash Player permanently from your Windows device. Once installed, you cannot uninstall KB4577586. For more details about Microsoft’s plans, see Update on Adobe Flash Player End of Support.

^12/8/20 REMINDER Windows 10, version 1903 reached end of servicing on December 8, 2020. To continue receiving security and quality updates, Microsoft recommends that you update to the latest version of Windows 10. If you want to update to Windows 10, version 1909, you must use the Enablement Package KB4517245 (EKB). Using the EKB makes updating faster and easier and requires a single restart. For more information, see Windows 10, version 1909 delivery options.

^11/19/20 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 1909 update history home page.

Note Follow @WindowsUpdate to find out when new content is published to the release information dashboard.

Highlights

Updates an issue with zoom that occurs when using Microsoft Edge IE Mode on devices that use multiple high-DPI monitors.
Updates an issue with Japanese input that occurs after focus changes between boxes in Microsoft Edge Legacy.
Updates an issue that displays nothing or shows “Computing Filters” indefinitely when you filter File Explorer search results.

Improvements and fixes

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

Removes the Microsoft Edge Legacy desktop application that is out of support. For more information, see New Microsoft Edge to replace Microsoft Edge Legacy with April’s Windows 10 Update Tuesday release
Addresses an issue with zoom that occurs when using Microsoft Edge IE Mode on devices that use multiple high-DPI monitors.
Allows administrators to use a Group Policy to enable extended keyboard shortcuts, including Ctrl+S, for users in Microsoft Edge IE Mode.
Addresses an issue that might cause a deadlock when a COM server delivers an event to multiple subscribers in parallel.
Addresses an issue with Japanese input that occurs after focus changes between boxes in Microsoft Edge Legacy.
Addresses issue that causes 16-bit apps that run on NT Virtual DOS Machine (NTVDM) to stop working when you open them.
Addresses an issue with USB 3.0 hubs. A device connected to the hub might stop working when you set the device to hibernate or restart the device.
Addresses an issue that prevents users from adjusting or turning off the touchpad because of administrative settings.
Addresses an issue that displays nothing or shows “Computing Filters” indefinitely when you filter File Explorer search results.
Updates the Volgograd, Russia time zone from UTC+4 to UTC+3.
Adds a new time zone, UTC+2:00 Juba, for the Republic of South Sudan.
Addresses an issue with the Windows Event Log Forwarding client, which returns the first matching certificate without checking private key permissions. With this update, the Windows Event Log Forwarding client selects the client’s certificate only if the Network Service has read permissions for the private key.
Addresses an issue that causes PowerShell-based monitors to stop working when you enable transcription on the systems.
Addresses an issue that stops BranchCache from working if you activate Windows using Cloud Solution Provider (CSP) license.
Addresses an issue that prevents App-V applications from opening and generates error 0xc0000225.
Addresses an issue in which some machines enrolled with a mobile device management (MDM) service fail to sync if the device manufacturer's name contains a reserved character.
Addresses an issue with using a configuration service provider (CSP) policy to configure a custom setting for Audit Other Logon/Logoff events. The custom setting fails to take effect.
Updates the Open Mobile Alliance (OMA) Device Management (DM) sync protocol by adding a check-in reason for requests from the client to the server. The check-in reason will allow the MDM service to make better decisions about sync sessions. With this change, the OMA-DM service must negotiate a protocol version of 4.0 with the Windows OMA-DM client.
Addresses an issue with credential roaming that occurs when Windows Hello for Business is enabled.
Addresses an issue that prevents users from using the Remote Desktop Protocol (RDP) to connect to a Windows Server 2019 device that is in Desktop Experience mode.
Addresses an issue that might prevent Hypervisor-Protected Code Integrity (HVCI) from being enabled when you configure it using a Group Policy.
Addresses an issue that causes multiple instances of appidcertstorecheck.exe to run on a system when AppLocker is enabled and the system is not on the internet.
Addresses an issue that causes a black screen or delays signing in to a Hybrid Azure Active Directory joined machine while the machine attempts to connect to login.microsoftonline.com.
Addresses an issue that prevents the Chromium-based Microsoft Edge from working. This issue occurs when Microsoft Edge is used in combination with Microsoft App-V and fonts are enabled inside the virtual environment.
Addresses possible race conditions that occur when the system calls NtOpenKeyEx(),which results in a stop error.
Addresses an issue with high memory usage when performing XSLT transforms using MSXLM6.
Addresses an issue that prevents Server Message Block 1 (SMB1) clients from accessing the SMB share after restarting the LanmanServer service.
Addresses an issue that might cause the cluster network interface to stop working for a short time. As a result, the network interface controller (NIC) is marked as failed. When the network is operational again, the system might not detect that the NIC is working and the NIC remains in a failed status.
Addresses an issue with signing in to a device that is in the current domain by using the default user profile of a device that is in a different, but trusted domain. The profile service of the current domain cannot retrieve the default user profile from the trusted domain and uses the local default user profile instead.
Addresses an issue with evaluating the compatibility status of the Windows ecosystem to help ensure application and device compatibility for all updates to Windows.
Addresses an issue that turns on Caps lock unexpectedly when using RemoteApp.
Addresses an issue with the svhost process that hosts the Microsoft-Windows-TerminalServices-LocalSessionManager. The svhost process consumes increasingly large amounts of memory because of a leak in COMMAND_ENTRY objects. Memory leaks might cause issues when signing in to an application or to the Remote Desktop. In extreme cases, the server might stop responding.
Addresses an issue that prevents you from specifying up to 255 columns when you use the Jet Text installable indexed sequential access method (IISAM) format.

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

Symptom

Workaround

Scroll bar controls might appear blank on the screen and not function after installing this update. This issue affects 32-bit applications running on 64-bit Windows 10 (WOW64) that create scroll bars using a superclass of the USER32.DLL SCROLLBAR window class. This issue also affects HScrollBar and VScrollBar controls that are used in Visual Basic 6 applications and the classes derived from System.Windows.Forms.ScrollBar that are used in .NET Windows Forms applications. A memory usage increase of up to 4 GB might occur in 64-bit applications when you create a scroll bar control.

Scroll bars you create using the SCROLLBAR window class or using the WS_HSCROLL and WS_VSCROLL window styles function normally. Applications that use the scroll bar control that is implemented in COMCTL32.DLL version 6 are not affected. This includes .NET Windows Forms applications that call Application.EnableVisualStyles().

This issue is resolved in KB5003169.

How to get this update

Before installing this update

Prerequisite:

You must 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 KB5001205 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 5000850.

March 25, 2021—KB5000850 (OS Build 18363.1474) Preview

Highlights

Improvements and fixes

Known issues in this update

How to get this update

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