Posted by: kurtsh | August 17, 2020

NEWS: IE 11 & Edge Legacy losing Microsoft 365 support beginning Nov 30, 2020


Enterprises & government agencies should start moving to Microsoft Edge (Chromium) “with IE Mode” & away from Internet Explorer 11 & Microsoft Edge (Legacy).


  • Microsoft Teams web app will no longer support IE 11, beginning November 30, 2020
  • All Microsoft 365 apps and services will no longer support IE 11, beginning August 17, 2021.

To be clear:

  • IE 11 will still work & be supported by Microsoft support as part of Windows.
  • IE 11 will no longer be tested or assured to function with Microsoft 365 services such as:
        • Microsoft Teams web client
        • Microsoft Outlook web client
        • Any of the Microsoft 365 services such as SharePoint Online, OneDrive for Business, Yammer Enterprise, etc.

The Trident HTML engine is basically no longer supported.  This means that Edge Chromium “IE mode” will ALSO not be a supported means of accessing Microsoft 365 services either:

Note: Using Internet Explorer mode in the new Microsoft Edge will not help to extend IE 11 access to Microsoft 365 apps and services beyond the dates listed above. Microsoft 365 apps and services will stop supporting IE 11 on the dates listed.

For more details, including information on how to get help to transitioning to the new Edge Chromium, read the announcement here:


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