Configure On-Premises Public Folders for a Hybrid Deployment with Exchange 2013

situation Exchange Hybrid environment (Office 365 – Exchange Online) with Exchange 2013 on premise. Public Folders are hosted on-premise and need to be accessed by online users. problem The only official documentation provided by Microsoft how to configure on-premises public folder access (http://technet.microsoft.com/en-us/library/dn249373(v=exchg.150).aspx), talks about "legacy public folders". Which in this case are Public folders...