When you use Microsoft Exchange Server 2010 Outlook Web App to access shared folders that are shared from a Microsoft Exchange Server 2013 mailbox, you receive the following error message:
A problem occurred while you were trying to use your mailbox
This issue occurs because a special mailbox property is not converted correctly to MAPI for Outlook Web App.
To fix this issue, install Cumulative Update 10 for Exchange Server 2013.
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.