Forum Discussion
Create shared mailbox on Hybrid environment - directly on O365 or onpremises then migrate it to O365
Hi Carlos,
If you have an Hybrid, your autodiscover is pointing to your on-premises Exchange. If you create your Mailbox only in Cloud, your AD and Exchange does not have any propreties of that mailbox, that is the issue.
The method that works for me is:
1) create a user mailbox in OnPrem Exchange
2) move the user mailbox to office 365
3) Once move is completed, Convert to shared mailbox (either through EAC or EXO PS using set-mailbox -type shared cmd)
4) remove license as it is no longer needed for shared mailbox
5) Assign mailbox delegation to required users
This ensures the mailbox is known between both Exchange onprem and Exchange online realms and doesn't bypass the federation if it's created in the cloud originally. The only Exchange objects that should be recreated in the cloud for a hybrid deployment are DDGs since they can't sync through AAD Connect. Every other EX object should always be created in onprem realm and then synced to EXO via AAD Connect.
Thank you that work perfectly