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mediumExchangedeprecationm365_message_center · Aug 3, 2026
(Updated) Migrate Free/Busy, MailTips, and Calendar Sharing before EWS deprecation
Administrators and developers are advised to migrate cross-tenant collaboration features like Free/Busy, MailTips, and Calendar Sharing before EWS deprecation on October 1, 2026, to ensure continued functionality.
“Services: Exchange Online. <p>Updated September 29, 2026: We have updated the content and timeline. Thank you for your patience.</p><p>[What and Why:]</p><p>Exchange Web Services (EWS) deprecation begins <b>October 1, 2026</b>. Cross-tenant collaboration features — Free/Busy, MailTips, and Calendar Sharing — currentl…”
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cloud_security
Audience
admindeveloper
Environment
cloud
Classification confidence: 95%
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