We wanted to demystify the process of syncing and provisioning of various recipient objects in Exchange Online. Some of this content might be already familiar to you but some will be new and will (ho...
Updated Jul 29, 2024
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Demystifying Exchange Online Provisioning: Architecture, Exchange Object Types, and Attributes
AlbertoP
Microsoft
MicrosoftChristianSchindler thanks for the recognition on the article!.
Regarding the behavior you're mentioning, this is by design and documented here.
Basically, the way migrated mailboxes will behave will depend on whether the 'ACLableSyncedObjectEnabled' property is set to True or False on the Organization Config of your Exchange on-premises (Get-OrganizationConfig | fl ACLableSyncedObjectEnabled). If you have that setting set to True, then migrated mailboxes will be ACLAble, if not then they won't :). As for the provisioning of remote mailboxes (New/Enable-RemoteMailbox) you have the -ACLableSyncedObjectEnabled parameter available as well so when you create a new remote mailbox make it ACLAble as well.