Now that we’ve shipped the new Microsoft Edge, and upgraded most of our Windows 10 customers to the new browser, we’re ending support for the Microsoft Edge Legacy desktop app on March 9, 2021.
The new Microsoft Edge is our best expression of a modern browser—we’re excited for customers to experience it. Apps and sites created for Microsoft Edge Legacy will continue to work in the new Microsoft Edge, but if a compatibility issue does arise, we have our App Assure promise to provide support. For more information, see the section below.
- After March 9, 2021, the Microsoft Edge Legacy desktop app will not receive new security updates.
Source: Microsoft 365 apps say farewell to Internet Explorer 11 and Windows 10 sunsets Microsoft Edge Legacy
Via Microsoft outlines its IE, legacy Edge phase-out timetable | ZDNet