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Sharing free/busy (also known as calendar availability) information between users in on-premises Exchange and Exchange Online is one of the primary benefits of a hybrid deployment. Users in both organizations can view each other's calendars as if they were located in the same physical organization. This configuration makes scheduling meetings and resources easy and efficient.
Several components in a hybrid deployment are required to enable the shared free/busy feature between your on-premises Exchange organization and Exchange Online.
OAuth authentication: In supported Exchange hybrid deployments, OAuth provides authentication for cross-premises features such as free/busy sharing. HCW configures OAuth when the corresponding hybrid configuration option is selected. For dedicated Exchange hybrid application requirements, see Deploy dedicated Exchange hybrid app.
Organization relationships: Organization relationships are needed for both the on-premises Exchange and Exchange Online organization. These relationships are configured automatically by the Hybrid Configuration wizard. An organization relationship defines the level of free/busy information that's shared from the organization.
By default, the free/busy data access sharing level is Free/busy access with time, plus subject and location for both the on-premises and Exchange Online organization relationships. You can manually configure the organization relationship access level after the Hybrid Configuration wizard has completed.
Learn more at Sharing.
In a supported Full Hybrid deployment, HCW configures shared free/busy when the corresponding OAuth and organization relationship options are selected. Federation Trust/EWS will no longer be supported for hybrid free/busy.
Learn more at Hybrid components.
The following features use cross-premises authentication and organization relationships as applicable.
| Messaging area | Feature |
|---|---|
| Email client | Message tracking MailTips Multi-mailbox search |
| Compliance | Exchange Online Archiving Exchange In-place eDiscovery |