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Change stream · Exchange Server update known issues

Availability (free/busy) fails for delegated mailboxes in Exchange hybrid deployments that use Graph API only

2 Oct 2026 · Exchange Server SE

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In a classic hybrid deployment that's configured by using ConfigureExchangeHybridApplication.ps1 -UseGraphApiOnly, availability (free/busy) information fails when a remote mailbox user accesses a delegated on-premises mailbox…

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