Access is denied.
Moving a user mailbox is done in the Microsoft Exchange Administrator program by accessing the Move Mailbox command from the Tools menu and can only be done between Microsoft Exchange Severs in the same Microsoft Exchange Site. Moving mailboxes between Servers in a Site with the Move Mailbox utility can cause previously assigned permissions on the mailbox to be temporarily lost. Any users that previously accessed the appointment book using default access permissions subsequently fail. Users with explicit permissions to the appointment book do not experience this error. Click OK, which will effectively reset the permissions and allow clients with permissions to view the schedule.