Add-PublicFolderClientPermission cmdlet or the AddUsersToPFRecursive.ps1 user management script to specify the permissions for the client user. You can create the access rights by using either the predefined permission roles or by creating
custom access rights. if you are following the below URl and getting any error please let us know. thanks ...
How to Add Permissions for Client Users to Access Public Folder Content
http://technet.microsoft.com/en-us/library/aa998834(v=exchg.80).aspx
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