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.

https://technet.microsoft.com/en-us/library/jj916671(v=exchg.150).aspx

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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