Exchange 2013 fix public folder and hierachy issue

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Job Description

Hi,
We have exchange 2013. We have 2 Public Folder Mailboxes:
Mailbox1 (Primary Hierarchy)
Public Folder Mailbox (Secondary Hierarchy)

The Primary Hierarchy is on old exchange 2013 server and the Secondary Hierarchy is on the new exchange 2013 server.

We need to remove the old exchange 2013 from the environment but cant because its the primary hierarchy.

Need someone to fix that.