Grant user access to delete email in a Public Folder

I have a user who needs to be able to delete mail from a Public Folder.  The user can access the Public Folder using Outlook and move emails to the folder and read emails in the folder but she cannot delete those emails. The Public Folder is called "photos folder" and the user is "mwhite".  I am running Exchange 2007 the user is running Outlook 2003.  

I have run the following Exchange Management Shell Command but this did not correct the problem: "C:\Add-PublicFolderClientPermission -Identity "\photos folder" -AccessRights Author -User mwhite"

Any idea what I am doing wrong?
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Select the appropriate role from list and assign the permissions
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If you logon to a PC with Outlook as the exchange administrator you can right click the public folder and add permissions for the user.
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