News

Microsoft Releases Windows 10 Build 21387

By Brian Burgess

Published May 21, 2021

Microsoft today is releasing Windows 10 preview build 21387 to Insiders in the Dev Channel. Here’s a look at what’s new.

Microsoft today is releasing Windows 10 preview build 21387 to Insiders in the Dev Channel. This release follows up build 21382. Today’s version is the first Insider build to come without Internet Explorer 11. The company is removing IE 11 from Windows 10 on June 15, 2022. Here is a look at what you can expect from this most recent Insider release.

Windows 10 Build 21387

There are no major new features to report with this release but it does contain the following 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.

And this is the list of fixes you can expect that are contained in this build:

• 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.

Keep in mind that Insider builds are meant for coders, IT admins, and Windows 10 enthusiasts who want to test new features and submit feedback to Microsoft.

These builds are not meant for inexperienced users. They are also not meant to run on your primary production machine. Insider builds contain many known stability issues that can cause your system to become unstable or even crash.

For more on this build’s full list of changes, known issues, and workarounds make sure to read Microsoft’s full blog post.