May 20, 2021—KB5003212 (OS Build 18363.1593) Preview

Release Date:

5/20/2021

Version:

OS Build 18363.1593

5/11/21
REMINDER Windows 10, version 1909 reached end of service on May 11, 2021 for devices running the Home, Pro, Pro for Workstation, Nano Container, and Server SAC editions. After May 11, 2021, these devices will no longer receive monthly security and quality updates that contain protection from the latest security threats. To continue receiving security and quality updates, Microsoft recommends updating to the latest version of Windows 10

We will continue to service the following editions: Enterprise, Education, and IoT Enterprise.

4/13/21
REMINDER
Microsoft removed the Microsoft Edge Legacy desktop application that is out of support in March 2021. On April 13, 2021, we installed the new Microsoft Edge. For more information, see New Microsoft Edge to replace Microsoft Edge Legacy with April’s Windows 10 Update Tuesday release.

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

  • News and interests on the taskbar is now available to anyone who installs this update!

  • Improves the news and interests hover experience to prevent accidental openings. 

  • Adds the Open on hover option (checked by default) to the News and interests menu. To access it, right-click a blank space on the Windows taskbar and open the News and interests menu.

  • Updates an issue that prevents users from receiving geographic location information. 

  • Updates an issue with muting a phone call when you transfer the call. 

  • Updates  an issue that prevents a touch device from working as a serial mouse in multiple monitor situations. 

Improvements and fixes

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

  • Addresses an issue with the just-in-time (JIT) behavior of jscript9.dll.

  • Addresses an issue that might cause a device to stop responding during hybrid shutdown.

  • Addresses an issue that prevents a touch device from working as a serial mouse in multiple monitor situations.

  • Addresses an issue in Safe Mode that prevents users from signing in if Web Sign-in is enabled.

  • Addresses an issue in Active Directory (AD) Admin Center that displays an error when it lists many organizational units (OU) or container objects and PowerShell Transcription is enabled. The error message is, "Collection was modified after the enumerator was instantiated".

  • Addresses an issue with devices that were configured using mobile device management (MDM) RestrictedGroups, LocalUsersAndGroups, or UserRights policies. These devices incorrectly continue to receive the policy after you use MDM to remove the configuration profile that has the policy. As a result, users of the affected devices might have incorrect group memberships and UserRights assignments or other symptoms. This issue occurs after installing Windows updates from October 20, 2020 and later.

  • Addresses an issue with the Autopilot Reset command taking too long to process after it has been sent.

  • Addresses an issue that might cause application installers to fail. This issue occurs when you enable Address Space Layout Randomization (ASLR) using the PowerShell command “set-processmitigation -system -enable forcerelocateimages”.

  • Addresses an issue that fails to apply BitLocker encryption. This issue occurs on removable drives that have a master boot record (MBR) active boot partition.

  • Addresses a memory leak issue in PKU2U that causes cluster nodes to run out of memory.

  • Addresses an issue that fails to register a DNS update to an A record and a PTR when Azure virtual machines update against corporate DNS zones.

  • Addresses an issue that prevents users from receiving geographic location information even when all the geolocation UI settings are enabled correctly, and the device contains a location sensor.

  • Addresses an issue with muting a phone call when you transfer the call.

  • Addresses an issue with per-user profiles that occurs after you set the Group Policy Object “Allow everyone to create all user profiles” to “Disabled”. After restarting the device, Wi-Fi doesn’t automatically reconnect when using per-user profiles.

  • Addresses an issue that prevents a task from working correctly when you set the condition “Start only if the following network connection is available” for the task.

  • Addresses a memory leak that might occur in some Remote Desktop screen sharing scenarios.

  • Addresses an issue with the PerfMon API that might cause handle leaks, which slow performance.

  • Updates Delivery Optimization to accept a custom port in the DOCacheHost configuration.

  • Addresses an issue that might cause endless replication when you promote a new domain controller and the Active Directory Recycle Bin feature is enabled.

  • Addresses an issue that sporadically prevents the Resource Host Subsystem (RHS) from registering network name resources in the Domain Name System (DNS). As a result, Event ID 1196 appears.

  • Addresses a timing issue that might cause a RemoteApp to intermittently duplicate characters that were entered on the local keyboard or pasted from the Windows clipboard.

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

System and user certificates might be lost when updating a device from Windows 10, version 1809 or later to a later version of Windows 10. Devices will only be impacted if they have already installed any Latest cumulative update (LCU) released September 16, 2020 or later and then proceed to update to a later version of Windows 10 from media or an installation source which does not have an LCU released October 13, 2020 or later integrated. This primarily happens when managed devices are updated using outdated bundles or media through an update management tool such as Windows Server Update Services (WSUS) or Microsoft Endpoint Configuration Manager. This might also happen when using outdated physical media or ISO images that do not have the latest updates integrated.

Note Devices using Windows Update for Business or that connect directly to Windows Update are not impacted. Any device connecting to Windows Update should always receive the latest versions of the feature update, including the latest LCU, without any extra steps.

If you have already encountered this issue on your device, you can mitigate it within the uninstall window by going back to your previous version of Windows using the instructions here. The uninstall window might be 10 or 30 days depending on the configuration of your environment and the version you’re updating to. You will then need to update to the later version of Windows 10 after the issue is resolved in your environment. Note Within the uninstall window, you can increase the number of days you have to go back to your previous version of Windows 10 by using the DISM command /Set-OSUninstallWindow. You must make this change before the default uninstall window has lapsed. For more information, see DISM operating system uninstall command-line options.

We are working on a resolution and will provide updated bundles and refreshed media in the coming weeks.

After installing this update and restarting your device, you might be unable to sign into some Microsoft 365 desktop client apps such as Microsoft Teams, OneDrive for Business and Microsoft Outlook. You might also receive an 80080300 error or "We ran into a problem. Reconnecting…" when attempting to authenticate or sign into Teams.

Note Mobile, web and non-Windows versions are not impacted.

This issue is resolved in KB5003635.

How to get this update

Before installing this update

Prerequisite:

You must install the April 13, 2021 servicing stack update (SSU) (KB5001406) or the latest SSU (KB5003244) 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 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.

Windows Update for Business

No

None. These changes will be included in the next security update to this channel.

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 5003212

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