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Release Date:

5/20/2021

Version:

OS Build 17763.1971

5/11/21
REMINDER 
Windows 10, version 1809 reached end of service on May 11, 2021 for devices running the Enterprise, Education, and IoT Enterprise 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 G, HoloLens, and the LTSC editions for Client, Server, and IoT.

5/11/21
REMINDER
Microsoft removed the Microsoft Edge Legacy desktop application that is out of support in April 2021. In the May 11, 2021 release, 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.

11/17/20
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 1809 update history home page.

 Highlights

  • 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 causes the Shutdown Event Tracker to appear every time you sign in, even after you dismiss the dialog correctly.

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

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

  • 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 an issue that sometimes causes event log entries to appear corrupted for Microsoft-Windows-Kerberos-Key-Distribution-Center source and Event IDs 4933, 4928, and 4937.

  • 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 might prevent the Windows Dynamic Host Configuration Protocol (DHCP) Server from offering a lease to a DHCPv6 client after the client moves to a different virtual LAN (VLAN).

  • 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.

  • Adds support for the USB Test and Measurement Class.

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

  • 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.

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

After installing KB4493509, devices with some Asian language packs installed may receive the error, "0x800f0982 - PSFX_E_MATCHING_COMPONENT_NOT_FOUND."

  1. Uninstall and reinstall any recently added language packs. For instructions, see Manage the input and display language settings in Windows 10.

  2. Select Check for Updates and install the April 2019 Cumulative Update. For instructions, see Update Windows 10.

Note If reinstalling the language pack does not mitigate the issue, reset your PC as follows:

  1. Go to the Settings app > Recovery.

  2. Select Get Started under the Reset this PC recovery option.

  3. Select Keep my Files.

Microsoft is working on a resolution and will provide an update in an upcoming release.

After installing KB5001342 or later, the Cluster Service might fail to start because a Cluster Network Driver is not found.

This issue occurs because of an update to the PnP class drivers used by this service.  After about 20 minutes, you should be able to restart your device and not encounter this issue.
For more information about the specific errors, cause, and workaround for this issue, please see KB5003571.

How to get this update

Before installing this update

Prerequisite:

You must install the May 11, 2021 servicing stack update (SSU) (KB5003243) or later 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 5003217.

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