check before: 2026-10-01
Product:
Exchange, Microsoft 365 admin center, Microsoft Graph
Platform:
Developer, Online, Web, World tenant
Status:
Change type:
User impact, Admin impact, Retirement
Links:
Details:
Summary:
Exchange Web Services (EWS) in Exchange Online will be phased out starting October 1, 2026, with full retirement by April 1, 2027, replaced by Microsoft Graph. Organizations must migrate workflows, configure AppID AllowList to continue EWS use after October 2026, or face permanent EWS access removal.
Details:
[Introduction]
We're updating the timeline and process for the retirement of Exchange Web Services (EWS) in Exchange Online. As previously announced, EWS will be retired in favor of Microsoft Graph, which offers improved security, modern authentication, and broader capability support. A phased disablement begins October 1, 2026, with permanent shutdown starting April 1, 2027.
[When this will happen:]
Phased EWS disablement begins: October 1, 2026
Full and permanent EWS retirement: April 1, 2027
EWS App AllowList feature availability: Coming soon (before retirement milestones)
Change Category:
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Scope:
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Release Phase:
Created:
2026-02-06
updated:
2026-02-06
Task Type
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Docu to Check
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MS How does it affect me
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MS Preperations
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MS Urgency
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MS workload name
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summary for non-techies**
Exchange Web Services (EWS) in Exchange Online will be phased out starting October 2026, with a complete shutdown by April 2027, requiring organizations to transition to Microsoft Graph for improved security and capabilities.
Direct effects for Operations**
EWS Access Loss
Without proper migration to Microsoft Graph or configuration of AppID AllowList, users will lose access to EWS-based applications, disrupting workflows related to mail and calendar.
- roles: IT Admin, End User
- references: https://learn.microsoft.com/exchange/clients-and-mobile-in-exchange-online/deprecation-of-ews-exchange-online
Workflow Disruption
Existing workflows that rely on EWS will fail, leading to potential delays in business processes and user frustration.
- roles: Business Analyst, End User
- references: https://learn.microsoft.com/exchange/clients-and-mobile-in-exchange-online/deprecation-of-ews-exchange-online
Increased Support Tickets
The sudden loss of EWS functionality may lead to a spike in support requests as users encounter issues with their applications.
- roles: Help Desk Support, IT Admin
- references: https://learn.microsoft.com/exchange/clients-and-mobile-in-exchange-online/deprecation-of-ews-exchange-online
Training and Documentation Needs
Users will require training and updated documentation to transition to Microsoft Graph, which may not be readily available without prior preparation.
- roles: Training Coordinator, End User
- references: https://learn.microsoft.com/exchange/clients-and-mobile-in-exchange-online/deprecation-of-ews-exchange-online
Compliance Risks
Failure to migrate or configure EWS settings may lead to compliance risks if workflows are disrupted, affecting data handling and reporting.
- roles: Compliance Officer, IT Admin
- references: https://learn.microsoft.com/exchange/clients-and-mobile-in-exchange-online/deprecation-of-ews-exchange-online
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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** AI generated content. This information must be reviewed before use.
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Last updated 2 months ago ago
