I have recently tried to establish the GAL Federation between two of my Office 365 Exchange Online tenants to share the Free busy Availability between those domains. I have used the domains exchangeonline.in and the free one manuphilip.onmicrosoft.com
1) Connect to Exchange Online through PowerShell as an administrator user on one of the domain (https://technet.microsoft.com/en-us/library/jj984289(v=exchg.150).aspx)
2) Find the existing Federation info between the domains under consideration. Substitute the domain name when asked as below:
3) Create a New Organization Relationship between the domains and set the Free Busy Properties. In this step, I am going to set the FreeBusyAccessLevel as ‘AvailabilityOnly’
Get-FederationInformation -DomainName “Domain Name” | New-OrganizationRelationship -Name ‘Federaion’ -Enabled $true -FreeBusyAccessEnabled $true -FreeBusyAccessLevel ‘AvailabilityOnly’ -FreeBusyAccessScope $null
4) Now check the Scheduling Assistant in owa or outlook and see it has shared as below: I have tried to check the availability info of a mailbox located in the federated domain
5) Similarly, you may also set the ‘FreeBusyAccessLlevel’ as ‘LimitedDetails’ for the existing OrganizationRelationship as below:
Set-OrganizationRelationship ‘Test-Federation’ -FreeBusyAccessLevel LimitedDetails
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