Microsoft released their November 2020 security update earlier this week, and it includes a few key improvements and a few known issues.

Listed below are some of the key improvements in the update:

  • Updates to improve security when using input devices such as a mouse, keyboard or pen

  • Updates to improve security when using Microsoft Office products

  • Updates to improve security when Windows performs basic operations

  • Security updates to the Microsoft Scripting Engine, Windows Input and Composition, Microsoft Graphics Component, the Windows Wallet Services, Windows Fundamentals, and the Windows Kernel

Known issues in this update include:

Symptom 1:

Users of Microsoft Input Method Editor (IME) for Japanese or Chinese language might experience issues when attempting various tasks. You might have issues with input, receive unexpected results or might not be able to enter text.


  1. Select Start, type Settings, and select it or press enter.

  2. Type IME Settings into the search box within Settings and select the IME settings that are appropriate to your language, for example Japanese IME Settings.

  3. Select General.

  4. Turn on Use previous version of Microsoft IME.

Note: Microsoft does not recommend using the compatibility setting for the long term, but rather as a temporary workaround for users who are impacted by the issue.

Symptom 2:

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 This primarily happens when managed devices are updated using outdated bundles or media through an update management tool such as Windows Server Update Services (WSUS) or Microsoft Endpoint Configuration Manager. This might also happen when using outdated physical media or ISO images that do not have the latest updates integrated.


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.