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Cross-tenant calendar sharing

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Cross-tenant calendar sharing

How to share calendar free/busy between Microsoft 365 tenants — organisation relationships and modern alternatives.

Solving Microsoft 365 · www.solvingmicrosoft365.com/guides/cross-tenant-calendar-sharing

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01

Exchange organisation relationships

The classic mechanism: configure an organisation relationship between two tenants. Once set up, users in Tenant A can see free/busy of users in Tenant B (with optional level — busy only, limited details, full details).

Solving Microsoft 365 · www.solvingmicrosoft365.com/guides/cross-tenant-calendar-sharing

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02

Limits of the classic model

Organisation relationships have caveats:

Solving Microsoft 365 · www.solvingmicrosoft365.com/guides/cross-tenant-calendar-sharing

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03

Modern alternative: Multi-Tenant Organisations

For organisations operating multiple Microsoft 365 tenants as one logical entity, Entra ID Multi-Tenant Organizations (MTO) provides a richer model:

Solving Microsoft 365 · www.solvingmicrosoft365.com/guides/cross-tenant-calendar-sharing

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04

B2B guest pattern

For ongoing partner collaboration, B2B guests in each other's tenants give the cleanest user experience:

Solving Microsoft 365 · www.solvingmicrosoft365.com/guides/cross-tenant-calendar-sharing

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Microsoft Bookings for external scheduling

For external customer-facing scheduling, Microsoft Bookings lets external customers book time on a staff member's calendar without any tenant relationship. The customer doesn't see free/busy directly — they see availabl…

Solving Microsoft 365 · www.solvingmicrosoft365.com/guides/cross-tenant-calendar-sharing

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06

Operational considerations

For organisations with significant ongoing cross-tenant work, the right answer depends on the relationship's depth:

Solving Microsoft 365 · www.solvingmicrosoft365.com/guides/cross-tenant-calendar-sharing

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