Here is some great articles i found, in the process of migrating public folders from legacy Exchange servers, to Exchange 2013 (More links will be added):
Nice article from Tony’s blog: http://thoughtsofanidlemind.com/2013/12/13/migration-modern-public-folders/
“Legacy Public Folder remnants in Exchange 2013 cause “The Microsoft Exchange Administrator has made a change…” prompt”:
https://exchangemaster.wordpress.com/2014/07/11/legacy-public-folder-remnants-in-exchange-2013-cause-the-microsoft-exchange-administrator-has-made-a-change-prompt/

