Microsoft has recently released Windows 10 Insider Preview Build 21387, which has the Eco Mode removed and Internet Explorer 11 retired. The makers have announced to disable IE 11 and replace it with the new Chromium-based Edge browser. Yet, it’s still accessible until next year through Edge. And the Eco Mode from Task Manager is removed after obtaining feedback from the users.

Retiring IE 11 and Removing Eco Mode

After 25 years of service, Microsoft officially retired the grand Internet Explorer browser for good. As the maker isn’t much from it since running on the old engine, it has now decided to replace it with the new Chromium-based Edge browser.

While it’s announced to be dumped as per roadmap, the IE v11 is still accessible through Edge browser as a window until next year. The Internet Explorer will be completely removed in June 2022, and all of its desktop apps and websites will be disabled or switched to Edge browser.

But if you wanted to try the legacy browser until then, you can enable the
Allow sites to be reloaded in Internet Explorer” option available in edge://settings/defaultbrowser. Toggle it on and restart the browser to see the websites loading in old Internet Explorer.

Besides this, Microsoft also decided to pull down the Eco Mode in Task Manager, which is set for throttling the heavy power-consuming apps and divert resources to desired apps. Removal of this feature is made after obtaining feedback from the users in Feedback Hub, and Microsoft thinks doing so refines “the experience and address several issues.

Alongside, the following fixes are released in Windows 10 Insider Preview Build 21387;

  • Fixed an issue in the previous flight where during the upgrade and in the welcome screens displayed after first sign in, the text was unexpectedly using the Times New Roman font.
  • Fixed an issue resulting in some Insiders seeing errors when trying to launch Notepad via the Run dialog.
  • Fixed an issue for WSL users, preventing some Linux GUI apps from launching correctly via the shortcut automatically added to the Start menu.
  • Fixed an issue resulting in the reset or change of PIN workflows not working.
  • Fixed an issue where the night light was immediately turning off after being enabled for some Insiders.
  • Fixed an issue in recent flights where you might unexpectedly get a “We can’t find an audio device” error when trying to play audio from a connected Bluetooth speaker.
  • Fixed an issue where explorer.exe might crash after repeated use of the touchpad gesture for switching Virtual Desktops.
  • Fixed two issues impacting the ability to print using USB printers.
  • Fixed an issue resulting in the Windows Update page potentially becoming unresponsive after clicking Pause Updates.
  • Fixed an issue causing some devices to fail with error code 0xc1900101. While this fix will resolve the problem on some devices, there is a second issue causing the same error code (noted below). We’re working on a fix for this issue as well.
  • Fixed an issue where some devices were re-offered the .NET update after installing. After taking this build, you should no longer be reoffered the .NET update. If you experience getting Build 21387 because of a pending .NET update, you can work around the issue by pausing then un-pausing updates.
  • Fixed an issue where some devices would crash with a DPC_WATCHDOG_VIOLATION error when using OneDrive Personal Vault.
  • Fixed a ctfmon.exe crash using ATOK (a third-party IME) if reconversion was triggered in some win32 apps.


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