Who is using a Contacts Public Folder

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Hi, I have a PF which users were looking at as an Outlook address book. I now want to delete that PF but I believe all users who have the PF as an address book will get sync errors once I delete it. Is there a way of knowing who is pointing to the PF so I can make sure they do not use it as an address book prior to delting it. This way I am hoping we will get no sync errors once it has gone.

Any advice or tools would be appreciated