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mediumExchangeshared calendarsupdatem365_message_center · Apr 21, 2026
(Updated) Auto upgrade of shared calendars from legacy MAPI model to modern REST model
Microsoft is automatically upgrading shared calendars from the legacy MAPI model to a modern REST model in Outlook and Exchange Online. This change improves calendar functionality and aligns with Microsoft's migration toward modern APIs, though it may affect existing calendar integrations that depend on the older MAPI interface.
“Services: Microsoft 365 suite. <p>Updated July 20, 2026: We have updated the timeline. Thank you for your patience.</p><p><strong>[Introduction]</strong></p><p>Microsoft is introducing an <strong>automatic upgrade for shared calendars</strong> in <em>Outlook and Exchange Online</em>, <strong>transitioning from the le…”
View original article →Audience
adminend_user
Environment
cloudhybrid
Ontology Topics
MD-102
Classification confidence: 95%
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