Microsoft has released a new cumulative KB5003212 update for Windows 10 1909. This is an optional update containing the bug fixes and performance optimization and lets users try the June 2021 Patch Tuesday fixes. Since it’s optional, users have to update through the settings manually. Alongside this patch, Microsoft announced the end of Windows 10 1909, as it stops serving security updates to it further.

Windows 10 June Preview Update Released

For users who wanted to try June’s Tuesday patch update, Microsoft has released a preview version of it called KB5003212. This is a cumulative and optional update and rolling to Windows 10 1909 users who have installed the KB5001406 or KB5003244 updates earlier. The KB5003212 update has fixes for earlier bugs and performance optimization features.

Updating to KB5003212 will let users test the upcoming fixes set in June 2021 Patch Tuesday update. Since it’s optional, interested users should manually update their systems by going through Settings > Update and Security and click on > Check for Updates. Once eligible, users will see the KB5003212 update available for download. Install and restart to see the following changes,

  • 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 the 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 Active Directory (AD) Admin Center issue 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 configured using mobile device management (MDM) RestrictedGroupsLocalUsersAndGroups, or UserRights policies. These devices incorrectly continue to receive the policy after using 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 being 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-process mitigation -system -enable forcerelocateimages.”
  • Addresses an issue that fails to apply BitLocker encryption automatically using a Group Policy. This issue occurs on external drives with 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 “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 entered on the local keyboard or pasted from the Windows clipboard.
Microsoft has also stated that the following known issues exist with this release. The issue below has been affecting Windows 10 since November 2020.
Symptom Workaround
System and user certificates might be lost when updating a 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 that 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 connecting 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 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 in to 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.

To mitigate this issue on most devices, you can restart your device a second time. Most devices will sign into affected apps as expected for all subsequent restarts after the first restart that completes the installation of the update. If restarting does not mitigate the issue on your device, you can use the web versions of the apps:

We are presently investigating and will provide an update in an upcoming release.


Alongside the rollout of the KB5003212 update, Microsoft has also reminded users about the end of Windows 10 1909 OS. This means the company will not be serving security updates for v1909 anymore, leaving it vulnerable to any security threats. To individuals who wanted to remain safe, Microsoft recommends updating to the latest version of Windows 10.

A note to consider, Microsoft stopped serving individuals like Home, Pro, Pro for Workstation, Nano Container, and Server SAC editions but will be extending support for v1909 on Enterprise, Education, and IoT Enterprise editions.


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