Using Mailbox Permissions

When you create a new mailbox, Exchange uses information from the mailbox store to create the default permissions for the new mailbox. The default folders in the new mailbox inherit permissions from the mailbox itself. Users can modify the permissions on folders in their mailbox using Outlook. Outlook uses MAPI permissions, which Exchange automatically converts to Windows 2000 permissions when it is storing the changes.

Although you can use Exchange System Manager to delete or move mailboxes, you cannot use it to access mailbox content or mailbox-related attributes of the user. Use Active Directory Users and Computers to perform administrative tasks on the Exchange-related attributes of user objects. Additionally, you must use Active Directory Users and Computers to give users permission to access the mailbox itself.