Using Public Folder Permissions
Controlling access to public folders is more complex than controlling access to mailboxes. This section presents information that will help you understand:
The different types of permissions that can be set on public folders.
What you must consider when you work with client permissions. Read this section before you modify client permissions.
What you must consider when setting public folder permissions in an environment where Exchange 2003 and Exchange 5.5 servers coexist.
How to designate a user as a public folder delegate.
The minimum permissions that are required for mail-enabled public folders to function correctly.