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highExchangeExchange Web Services (EWS)deprecationm365_message_center · Aug 3, 2026
Migrate Free/Busy, MailTips, and Calendar Sharing before EWS deprecation
Exchange Web Services (EWS) is being deprecated starting October 1, 2026, affecting cross-tenant collaboration features like Free/Busy, MailTips, and Calendar Sharing which currently rely on EWS. Administrators and security engineers need to migrate these features before the deprecation date.
“Services: Exchange Online. <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 — currently rely on EWS.</p><p>Cross-tenant Free/Busy, MailTips, and Calendar Sharing via Microsoft 365 Cross-Tenan…”
View original article →Audience
adminsecurity_engineer
Environment
cloud
Classification confidence: 95%
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