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Windows 10 Build 21387 drops Internet Explorer and Eco Mode in Task Manager

This Friday, Microsoft rolls out Windows 10 Build 21387 to Insiders in the Dev channel. As it was earlier announced, it no longer includes Internet Explorer 11 preinstalled. But to our surprise, yet another feature is now removed from the OS - the Eco Mode option in Task Manager.

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Using Eco Mode, you could identify apps that consume high resources. Eco Mode could be used to limit such app's resource consumption so that the system gives priority to other apps. However, Windows 10 Build 21387 doesn't include it, as developers  are about to refine the experience and address several issues they have learned about from collected feedback.

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As for Internet Explorer 11, earlier Microsoft announced that they remove it from the default Windows 10 bundle.  Internet Explorer 11 will reach its end of support on June 15, 2021. The company mentioned three main reasons to ditch the old browser in favor of the new Microsoft Edge: better compatibility, streamlined productivity, and better browsing security.

Well, here are the changes in today's Insider Preview release.

What's new in Windows 10 Build 21387

Changes and Improvements

  • The Internet Explorer 11 desktop application is now retired as of this Insider Preview build. For additional details see https://aka.ms/IEmodeblog.
  • We are turning off the “Eco mode” feature in Task Manager in order to refine the experience and address several issues thanks to Windows Insider feedback.

Fixes

  • We 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.
  • We fixed an issue resulting in some Insiders seeing errors when trying to launch Notepad via the Run dialog.
  • We fixed an issue for WSL users, preventing some Linux GUI apps from launching correctly via the shortcut that is automatically added to Start menu.
  • We fixed an issue resulting in the reset or change PIN workflows not working.
  • We fixed an issue where for some Insiders, night light was immediately turning off after being enabled.
  • We 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.
  • We fixed an issue where explorer.exe might crash after repeated use of the touchpad gesture for switching Virtual Desktops.
  • We fixed two issues impacting the ability to print using USB printers.
  • We fixed an issue resulting in the Windows Update page potentially becoming unresponsive after clicking Pause Updates.
  • We 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.
  • We fixed an issue where some devices were re-offered the .NET update after it is installed. After taking this build you should no longer be reoffered the .NET update. If you experience and issue getting Build 21387 because of a pending .NET update, you can work around the issue by pausing then un-pausing updates.
  • We fixed an issue where some devices would crash with a DPC_WATCHDOG_VIOLATION error when using OneDrive Personal Vault.
  • We fixed a ctfmon.exe crash when using ATOK (a third-party IME) if reconversion was triggered in some win32 apps.

Known issues

  • The Windows Camera App currently does not respect the default brightness setting set via the new Camera Settings page.
  • We’re investigating an issue where elements of Search (including the search box in File Explorer) are no longer displaying correctly in dark theme.
  • [News and interests] We’re investigating an issue where the flyout may occasionally flash in the top left corner of your screen after clicking the button on your taskbar.
  • We’re working on a fix for a second issue causing some devices to fail when updating to this build with error code 0xc1900101. When the update fails, it will roll back to the previous build. If you are encountering this issue, we recommend pausing updates until we release a build with the fix.

If you have configured your device to receive updates from the Dev Channel/Fast Ring ring, open Settings - > Update & recovery and click on the Check for Updates button on the right. This will install the latest available Insider Preview of Windows 10.

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Author: Sergey Tkachenko

Sergey Tkachenko is a software developer who started Winaero back in 2011. On this blog, Sergey is writing about everything connected to Microsoft, Windows and popular software. Follow him on Telegram, Twitter, and YouTube.

One thought on “Windows 10 Build 21387 drops Internet Explorer and Eco Mode in Task Manager”

  1. The “Eco Mode” is just a fancy name for lowering process priority. A computation task requires a certain amount of energy to be done. There’s nothing “eco” about making it take longer?

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