You cannot preview Office documents in shared folders by using Outlook Web App in an Exchange Server 2013 environment

Applies to: Exchange Server 2013 EnterpriseExchange Server 2013 Standard Edition


You cannot preview Microsoft Office documents that are attached in shared folders by using Microsoft Outlook Web App in a Microsoft Exchange Server 2013 environment.


This issue occurs because shared mailboxes use the SecurityIdentifier value to identify the logged-on user’s address. However, Exchange returns the mailbox address instead of the logged-on user’s address to the value when you view the documents by using Outlook Web App.


To resolve this issue, install the following cumulative update: 
2892464 Description of Cumulative Update 3 for Exchange Server 2013


Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.