The following only applies to users who use Microsoft Teams via a web browser. It does not affect Desktop and mobile Teams clients.
To maintain security, performance, and long-term compatibility, Microsoft Teams on the web will require modern browser standards. Beginning May 15th, 2026, Teams on the web will only be supported on browsers that are compliant with ECMAScript 2022 (ES2022).
When this will happen
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Now through May 14th, 2026: Users on unsupported browsers will see reminder banners.
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Beginning May 15th, 2026: Teams on the web will be blocked on non-compliant browsers.
All currently supported versions of Microsoft Edge, Google Chrome, Mozilla Firefox, and Safari are ECMAScript 2022 (ES2022) compliant. Browsers that are out of vendor support should be assumed non-compliant. A browser is considered “out of vendor support” when its publisher no longer provides updates or security fixes; these browsers should be assumed unsupported for Teams on the web.
For more information, please contact the Service Desk on 01603 475603 or email ict@norfolk.gov.uk