KB4580346

Adds a notification to Internet Explorer 11 that informs users about the end of support for Adobe Flash in December 2020.  For more information, see KB4581051.

Updates 2021 time zone information for Fiji.

Updates to improve security when Windows performs basic operations.

Updates for storing and managing files.

Provides the ability to sync the Microsoft Edge IE Mode unidirectional session cookie when an administrator configures the session cookie.

Adds a notification to Internet Explorer 11 that informs users about the end of support for Adobe Flash in December 2020. For more information, see KB4581051.

Addresses an issue with Microsoft Edge IE Mode that occurs when you enable Configure enhanced hang detection for Internet Explorer mode in Microsoft Edge.

Addresses an issue that causes apps that use Dynamic Data Exchange (DDE) to stop responding when you attempt to close the app.

Updates 2021 time zone information for Fiji.

Addresses an issue with creating HTML reports using tracerpt.

Addresses an issue with the Group Policy service that might recursively delete critical files in alphabetic order from %systemroot%\system32. This issue occurs when a policy has been configured to delete cached profiles. These file deletions might cause stop error “0x5A (CRITICAL_SERVICE_FAILED)” boot failures.

Addresses an issue that causes Windows to stop working and generates error 0x17. This issue occurs when Windows Defender Device Guard is enabled, and a driver is loaded with a 4K Microsoft Portable Executable (PE) header.

Addresses an issue with creating null ports using the user interface.

Addresses an issue that might prevent you from accessing the Security Options data view in the Group Policy Management Editor (gpedit.msc) or Local Security Policy Editor (secpol.msc). The error is, "MMC has detected an error in a snap-in”.

Security updates to Windows App Platform and Frameworks, Windows Fundamentals, Windows Virtualization, Windows Kernel, and Windows Storage and Filesystems.