Office 365 – Exchange Online Organizational Sharing

Recently I worked with a partner that was doing a larger tenant to tenant migration. Fortunately they were moving from one domain to another and are doing a staged migration with MigrationWiz; because they will have users in one of two tenants, they will need to share free/busy information between the two tenants. This is easily done by setting up Exchange Organizational Sharing between the two Office 365 tenants.

Open Office 365 admin center

Click Admin Centers

Click Exchange

Click Organization

Click Sharing

Click New on Organization Sharing

In the Relationship name, enter a friendly name for the relationship

In the Domains to share with box, enter the external Office 365 or Exchange on-premise domain

Click to Enable calendar free/busy information sharing

Set the sharing level for calendar free/busy information

Set which users can share calendar free/busy information.

Click save

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