GoKawiilMicrosoft explains how to re-enable disabled EWS API in Exchange Online
Microsoft has published steps for IT admins to restore access to the Exchange Web Services (EWS) API after apps relying on it began failing with login prompts or protocol errors. Admins can either uncheck a block option in the Microsoft 365 admin center's Baseline Security Mode or run a PowerShell command to re-enable EWS within four hours. Microsoft says this workaround only lasts until April 2027, when EWS will be permanently retired.
GoKawiil's interpretation of the reporting above, not reported fact.
The fix is a temporary reprieve rather than a permanent solution, since Microsoft says re-enabling EWS will stop working entirely in April 2027. This means organizations relying on older Outlook versions, desktop add-ins, or Apple Mail integrations still have a deadline to migrate to the Microsoft Graph API, which Microsoft describes as having near-complete feature parity for most use cases. Developers and IT teams who delay could face disruption once the final shutdown takes effect.
- Admins can re-enable EWS via Microsoft 365 admin center or a PowerShell command.
- EWS blocking began as default in October 2026, with full shutdown set for April 2027.
- Microsoft urges developers to migrate affected apps to the Microsoft Graph API before the deadline.
Source: bleepingcomputer.com, 2026-10-22
Published there as: “Microsoft shares how to fix broken Exchange Online EWS apps”
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