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mediumOutlookbreaking changelearn_intune · Sep 12, 2026

Calendar items have disappeared - Microsoft Q&A

Users are experiencing a breaking change where calendar items have disappeared from their Outlook 360 account. This issue affects both cloud and on-premises environments.

“Most of the items in my Outlook 360 calendar prior to March 2026 have disappeared. How do I retrieve them?”
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Audience
end_user
Environment
cloudon_premises
Classification confidence: 85%
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Calendar items have disappeared - Microsoft Q&A | 365Forge