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I want to know if its possible to securely share my outlook calendar with staff from our parent company, who use an on premise Exchange Server?
If I try to share in the normal way, I get the error message "Problem: This recipient's organization is not set up for secure sharing".
I realise that I can publish the calendar to the internet, but I want to restrict access to those invited, not merely those that have the link to the calendar.
To share calendar cross organizations, you should configure the federation trust between your on-premise domain and MFG first. And then, create two organization relationships between two organizations. It is a complex configuration that has many interrelated requirements and configuration steps. For a more detailed checklist and step-by-step instructions specific to your Exchange environment, we strongly recommend that you use the Exchange Server Deployment Assistant to help you setup hybrid deployment.
If the issue persists, please provide detailed information about the steps you used to share calendar.