Internet Explorer 11, legacy Edge losing Microsoft Support in 2021

After years of compatibility, Microsoft devs have decided to drop Internet Explorer 11 support for various Microsoft 365 applications, starting with Teams. This announcement was first posted on the Microsoft 365 blog.

The new changes go into effect on November 30th, 2020 beginning with Microsoft Teams. By August 17th, 2021 (a year to-the-date from the announcement) all of the remaining Microsoft 365 apps will no longer provide support for IE 11. Anyone using Internet Explorer 11 to connect to Microsoft 365 apps after the dates listed above will encounter serious degradation in performance. Some features may stop working entirely. While users can no longer use IE 11 for these apps and services, they can use Microsoft Edge’s Internet Explorer mode.