With most Exchange Organizations, we may be leveraging various types of resource mailboxes or Public Folders. When you start migrating users to Office 365, your Office 365 users will lose access to these delegated resources. If the resource is a conference room, the user will still be able to book time in that conference room and view the existing schedules; however, that's the extent of management for those resource objects. Public Folders are inaccessible, unless we connect the on-premises Public Folders to Exchange Online.
While you migrate on-premises mailboxes, you may need to consider moving these resources with the users moving to Office 365. Let's cover these various resources and how you need to prepare for their moves to Office 365. We will cover are the following resources: