Windows whats-new

Windows Assessment and Deployment Toolkit (ADK)
Device management
Security
Windows Defender Application Guard (WDAG)

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Windows Hello multi-camera support is added, allowing users to choose an external
camera priority when both external and internal Windows Hello-capable cameras are
present.
The new Chromium-based 
Microsoft Edge
 browser is included with this release. For
more information about what's new in Edge, see the 
Microsoft Edge insider
.
For more information on the general fixes, see the 
Windows Insider blog
.
This release includes the following enhancements and issues fixed:
a memory leak in Internet Explorer 11 that occurs when you use the Chinese
language pack.
COM+ callout policies that cause a deadlock in certain applications.
an issue that prevents certain Win32 apps from opening as a different user when
you use the runas
unexpected screens during the Windows Out of Box Experience (OOBE).
an issue that might cause a deadlock when a COM server delivers an event to
multiple subscribers in parallel.
an issue in Advanced display settings that shows the incorrect refresh rates
available for high dynamic range (HDR) displays.
an issue that might prevent certain CAD applications from opening if those
applications rely on OpenGL.
an issue that might cause video playback to flicker when rendering on certain low-
latency capable monitors.
an issue that sometimes prevents the input of strings into the Input Method Editor
(IME).
an issue that exhausts resources because Desktop Windows Manager (DWM) leaks
handles and virtual memory in Remote Desktop sessions.
Windows Hello
Microsoft Edge
General fixes

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a stop error that occurs at the start.
an issue that might delay a Windows Hello for Business (WHfB) Certificate Trust
deployment when you open the Settings-> Accounts-> Sign-in Options page.
an issue that might prevent some keyboard keys from working, such as the home,
Ctrl, or left arrow keys when you set the Japanese IME input mode to Kana.
removed the history of previously used pictures from a user account profile.
wrong language displayed on a console after you change the system locale.
host process of Windows Remote Management (WinRM) can stop working when it
formats messages from a PowerShell plugin.
Windows Management Instrumentation (WMI) service caused a heap leak each
time security settings are applied to WMI namespace permissions.
screen rendering after opening games with certain hardware configurations.
startup times for applications that have roaming settings when User Experience
Virtualization (UE-V) is turned on.
a principal in a trusted MIT realm fails to obtain a Kerberos service ticket from
Active Directory domain controllers (DC). This occurs on devices that installed
Windows Updates that contain CVE-2020-17049 protections and configured
PerfromTicketSignature to 1 or higher. These updates were released between
November 10, 2020 and December 8, 2020. Ticket acquisition also fails with the
error, "KRB_GENERIC_ERROR", if callers submit a PAC-less Ticket Granting Ticket
(TGT) as an evidence ticket without providing the
USER_NO_AUTH_DATA_REQUIRED flag.
high memory and CPU utilization in Microsoft Defender for Endpoint.
We enhanced data loss prevention and insider risk management solution
functionalities in Microsoft 365 endpoints.
an error when you attempt to open an untrusted webpage using Microsoft Edge or
open an untrusted Microsoft Office document. The error is, "WDAG Report -
Container: Error: 0x80070003, Ext error: 0x00000001". This issue occurs after
installing the .NET update KB4565627.
an issue that prevents wevtutil from parsing an XML file.
failure to report an error when the Elliptic Curve Digital Signature Algorithm
(ECDSA) generates invalid keys of 163 bytes instead of 165 bytes.

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We added support for using the new Chromium-based Microsoft Edge as the
assigned access single kiosk app. Now, you can also customize a breakout key
sequence for single app kiosks. For more information, see Configure Microsoft
Edge kiosk mode.
User Datagram Protocol (UDP) broadcast packets that are larger than the
maximum transmission unit (MTU). Devices that receive these packets discard
them because the checksum isn't valid.
the WinHTTP AutoProxy service doesn't comply with the value set for the
maximum Time To Live (TTL) on the Proxy Auto-Configuration (PAC) file. This
prevents the cached file from updating dynamically.
We improved the ability of the WinHTTP Web Proxy Auto-Discovery Service to
ignore invalid Web Proxy Auto-Discovery Protocol (WPAD) URLs that the Dynamic
Host Configuration Protocol (DHCP) server returns.
We displayed the proper Envelope media type as a selectable output paper type
for Universal Print queues.
We ended the display of a random paper size for a printer when it uses the
Microsoft Internet Printing Protocol (IPP) Class Driver.
We enabled Windows to retrieve updated printer capabilities to ensure that users
have the proper set of selectable print options.
We updated support for hole punch and stapling locations for print jobs with long
edge first paper feed direction on certain printers.
an issue that might cause the IKEEXT service to stop working intermittently.
an issue that might prevent a Non-Volatile Memory Express (NVMe) device from
entering the proper power state.
an issue that might cause stop error 7E in sys on servers running the Network File
System (NFS) service.
an issue that prevents the User Profile Service from detecting a slow or a fast link
reliably.
an issue that causes contention for a metadata lock when using Work Folders.
We added a new dfslogkey: 
Keypath: