Assume that a user who is in an exclusive scope tries to manage his mailbox in a Microsoft Exchange Server 2010 environment. For example, the user sets an automatic reply rule. In this situation, the operation fails.
This issue occurs because the Exchange Server 2010 server only checks the exclusive write scope to see whether the user has access permission, it does not check the write scope of a user itself.
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.