Object-Owner missing in Public Folder Calenders after Transition to Exchange 2013 SP1

Hi there,

we transfered all Public Folders from Exchange 2003 to 2010 to 2013 SP1. We have some Calendars with PublicFolderClientPermission Author witch includes EditOwnedItems and DeleteOwnedItems

Unfortunately the Author Rights wont work after migration. it seems like the creator of the object got lost.

since i never notices that in transitions from exchange 2003 to 2010, i think that should be related to the exchange 2013 transition.

Can anybody approve or disprove that behavior?

thanks alot