Security News > 2021 > March > Windows 10 ISO installs may fail to replace Microsoft Edge Legacy
Microsoft has addressed a known issue causing the new Microsoft Edge web browser not to install from custom Windows 10 installation media including updates released on Thursday, March 25.
Microsoft Edge Legacy is also being removed if using Windows 10 install media bundling the KB5000850 non-security release preview update for Windows 10 1909 and Windows Server 1909.
"Devices with Windows installations created from custom offline media or custom ISO image might have Microsoft Edge Legacy removed by this update, but not automatically replaced by the new Microsoft Edge," Microsoft explains.
The new Chromium-based Edge is the default Windows 10 web browser after replacing Edge Legacy, starting with Windows 10 Insider Preview Build 21313.
Edge Legacy will be permanently replaced in all Windows 10 builds by the new Microsoft Edge on all systems after installing April's Windows 10 Patch Tuesday security update.
In November 2019, Microsoft also fixed an issue triggered by managed Windows 10 systems being updated from outdated installation media and causing Windows 10 certificates to disappear.
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