Hybrid Environment:
On-premise - Ex2010 SP3, dirSync, ADFS...
Tenanat - Wave 14
FreeBusy lookup runs well in both directions.
Calendar Sharing from on-Premise users to users residing in Exchange Online works, no issues.
Calendar Sharing from Exchange Online users to users residing on-premises works as well except that the calendar will be shown as empty. On-Premise user receives the Calendar sharing invitation mail, accepts with "open calendar". Outlook (and OWA as well) opens the Exchange Online calendar without error message but there is no data visible. (Calendar is empty)
Any ideas?