I have a user that is attempting to add a rule on a Public Folder using some advanced settings.

We have removed the checkbox in Maintain per-user read and unread information for this folder as shown below:





After setting this I assumed I would be able to open up the following setting for them:



Can anyone tell me why this setting is not available and where I change it so that it is.



Note the users I have tested on all have owner permission on the Public Folder.