"Starting in October 2026, Microsoft will roll out a phased plan to phase out Exchange Web Services (EWS) in Exchange Online. Administrators will have control over the transition, but must migrate to Microsoft Graph before April 2027. The service, which was built almost 20 years ago, no longer meets today's requirements. Microsoft announced in 2018 that Exchange Web Services would no longer receive functionality updates. In 2023, it announced that EWS would be completely disabled in Exchange Online in October 2026."
"The phase-out will take place in stages and give administrators control over the process. Starting in October 2026, EWS will be blocked by default for tenants who have not explicitly indicated that they still want to use the service. A year later, on April 1, 2027, EWS will disappear from Exchange Online for good. By that time, all organizations must have switched to Microsoft Graph."
"EWS was developed almost 20 years ago and served the ecosystem well, but it no longer meets current requirements in terms of security, scalability, and reliability. Microsoft Graph can now provide functionality comparable to EWS in the vast majority of scenarios. Microsoft's own applications have already largely migrated from EWS or are nearing completion. Many third parties have already made the switch or are actively working on it."
Starting October 2026 Microsoft will begin a phased shutdown of Exchange Web Services (EWS) in Exchange Online, blocking EWS by default for tenants that have not opted to continue. Administrators can control the transition and will be able to define an AppID Allow List in early 2026 to limit EWS access to approved apps. All tenants must complete migration to Microsoft Graph by April 1, 2027, when EWS will be removed from Exchange Online. EWS is discontinued because it no longer meets modern security, scalability, and reliability requirements, and Microsoft Graph provides comparable functionality for most scenarios.
Read at Techzine Global
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