XCLN: Rights to Folder Require Reviewer Rights on Mailbox

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For example, if User1 wants to grant User2 rights to a folder named Projects, User1 must grant User2 at least Reviewer privilege to his Mailbox. By granting User2 Reviewer privilege to the Mailbox, User2 will be able to see all Top-Level folders. Also by granting Reviewer privilege to User2 on the Mailbox, User2 will be able to see any Sub-Folders contained in Projects.

This behavior is by design. Microsoft Exchange clients may consider it a security risk if the Microsoft Exchange user is only wanting to provide access to a particular folder and not to their Mailbox. If this is the case, Microsoft Exchange users should consider using public folders as a workaround for providing access to specific folders.