check before: 2026-05-15
Product:
Microsoft 365 Apps, Microsoft Edge, Teams
Platform:
Online, Web, Windows Desktop, World tenant
Status:
Change type:
User impact, Admin impact, Retirement
Links:
Details:
Summary:
Starting May 15, 2026, Microsoft Teams on the web will require browsers compliant with ECMAScript 2022. Unsupported browsers will show reminders until then, after which access will be blocked. Desktop and mobile clients are unaffected. Organizations should update browsers and inform users to ensure compliance.
Details:
Introduction
To maintain security, performance, and long-term compatibility, Microsoft Teams on the web will require modern browser standards. Beginning May 15, 2026, Teams on the web will only be supported on browsers that are compliant with ECMAScript 2022 (ES2022).
When this will happen
Now through May 14, 2026: Users on unsupported browsers will see reminder banners.
Beginning May 15, 2026: Teams on the web will be blocked on non-compliant browsers.
Change Category:
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Scope:
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Release Phase:
Created:
2026-02-12
updated:
2026-02-12
Task Type
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Docu to Check
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MS How does it affect me
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MS Urgency
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MS workload name
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summary for non-techies**
Starting May 15, 2026, Microsoft Teams on the web will require browsers to support ECMAScript 2022 standards, and users on older browsers will need to update to compliant versions like Microsoft Edge, Google Chrome, Mozilla Firefox, or Safari to maintain access.
Direct effects for Operations**
Access Blockage
Users on unsupported browsers will be blocked from accessing Teams on the web, leading to disruption in communication and collaboration.
- roles: End Users, IT Administrators
- references: https://techcommunity.microsoft.com/t5/microsoft-teams-blog/teams-on-the-web-browser-update-required-by-may-15-2026/ba-p/3731230
User Experience Degradation
Users will experience reminder banners prior to the enforcement date, which may lead to confusion and frustration if not properly communicated.
- roles: End Users, Helpdesk Staff
- references: https://techcommunity.microsoft.com/t5/microsoft-teams-blog/teams-on-the-web-browser-update-required-by-may-15-2026/ba-p/3731230
Increased Support Tickets
Helpdesk staff may face an influx of support tickets from users unable to access Teams due to outdated browsers, straining IT resources.
- roles: Helpdesk Staff, IT Administrators
- references: https://techcommunity.microsoft.com/t5/microsoft-teams-blog/teams-on-the-web-browser-update-required-by-may-15-2026/ba-p/3731230
Compliance Issues
Conditional Access policies may be affected, leading to potential security risks if users access Teams with unsupported browsers.
- roles: IT Administrators, Compliance Officers
- references: https://techcommunity.microsoft.com/t5/microsoft-teams-blog/teams-on-the-web-browser-update-required-by-may-15-2026/ba-p/3731230
Training and Communication Needs
Organizations will need to invest time in training and communicating the changes to ensure users are aware of the new requirements.
- roles: IT Administrators, End Users
- references: https://techcommunity.microsoft.com/t5/microsoft-teams-blog/teams-on-the-web-browser-update-required-by-may-15-2026/ba-p/3731230
Configutation Options**
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Potentional Risks**
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IT Security**
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explanation for non-techies**
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Last updated 4 weeks ago ago
