Trying to clean up our environment of unnecessarily synced objects. Of course, I want to sync users with e-mail, security groups, contacts, and so forth. However, the following top-level domain OUs I'm not sure about...
- Infrastructure: Even with "Advanced Features" ticked, I can't see this OU in ADUC
- Microsoft Exchange Security Groups
- Microsoft Exchange System Objects
- Program Data
- RegisteredDevices: This seems tied to Azure/Intune so I figure it's safer to keep it.
- System
- Users
We used to have an Exchange server merely for schema, not hosting any mailboxes on-premise. However, I decommissioned it a couple months ago per this article: Manage recipients in Exchange Server 2019 Hybrid environments | Microsoft Learn
There's also the "Exchange hybrid deployment" checkbox under "Optional features" that I'm unsure if I need anymore.
