The process will begin in the fall and end in a year.
Microsoft has announced that Microsoft 365 applications and services will permanently end support for the proprietary Internet Explorer version 11 browser in a year.
Starting November 30, 2020, the Microsoft Teams web app will no longer support IE 11. As of August 17, 2021, the remaining Microsoft 365 apps and services will no longer support IE 11.
After these dates, Microsoft 365 users will experience limited functionality when using Internet Explorer 11, or even be unable to connect to services at all. New Microsoft 365 features will not be available immediately, and existing ones may not work.
As noted by Microsoft, version 11 of Internet Explorer has been around since 2013, when the online environment was much less complex than it is now, and since then web standards and browsers have improved.