Forum Discussion
Shared mailbox not shown in Shared folder on On-premised Exchange server
Hi, I created a user account and assigned Office 365 license to it. It is shown in the Mailbox on both of On-Premises Exchange server and online Office 365. Then I converted the mailbox to Shared...
If you want on-premises to recognize this object as a shared mailbox, the proper workflow would be to migrate it on-premises, convert to shared, then move it back to O365. Or you can manually change the relevant attributes on-premises, although this is not a supported solution.
That's assuming you don't have a duplicate mailbox as Christopher suspects :)