Directory synchronization is running and mailbox-enabling most of the users, but a few are not getting mailbox-enabled.
When you view the problem target object in Active Directory Users and Computers, it looks like a mix of a user and a contact.
For example, there are Account and Profile tabs present, but the Exchange tabs look like they belong to a contact (there is no information store information on the Exchange General tab and Mailbox Rights button is missing on the Exchange Advanced page).
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