During the Exchange Public Folder Tree Structure Enumeration you will see a warning similar to below.
A duplicate public folder was found with path Publice Folder Name{23E27186-848B-456E-A701-46B49B60EF7A} and parent public folder guid {AC348C38-8636-444D-90C5-B305A5D987AB}.
There are duplicate Public Folder in the Exchange Org.
Either ignore the warnings or remove the duplicate Public Folder from your Exchange Organization
