Forum Discussion
Free/busy sharing Exchange Hybrid and Exchange Online
VasilMichev Thank you for the reply. So, just to make sure I have it correct, I don't need to create anything at all in Company B (assuming they don't want to share with anyone). From what I've read I keep thinking a federated trust needs to be created on that end and an org relationship on the side of sharing, but from your response it doesn't look that way, correct?
As detailed in the documentation: https://docs.microsoft.com/en-us/exchange/sharing/organization-relationships/organization-relationships
When you set up the organization relationship, you are setting up your side of the relationship and specifying the level of information that the users in the external organization can view. The external organization may set up the same or different settings on their side. For example, if Contoso creates an organization relationship with Tailspin Toys, the users at Tailspin Toys will be able to schedule meetings with the users at Contoso by adding their email address to the meeting invitation. The availability of the invited Contoso user would display to the Tailspin Toys user. However, before Contoso can also see availability for users at Tailspin Toys, their administrator needs to set up an organization relationship with Contoso.