Article ID: 983200 - View products that this article applies to.
You access a Microsoft Exchange Server 2010 mailbox by using Outlook Web App (OWA). In this scenario, when you download an .xls file attachment and then try to open the file, the file is empty. Currently, Exchange Server 2010 RTM cannot bypass XML Filtering for OWA attachments. XML attachments cannot be saved from messages when you use OWA.
This problem occurs if the .xls file contains XML data. If a file that contains XML data is attached to an email message, the XML content in the file is removed when you open or save the attachment by using OWA.
To resolve this problem, install the following update rollup:
982639After you apply this hotfix, a new option named "BypassOwaXmlAttachmentFiltering" is provided. An Exchange administrator may use the BypassOwaXmlAttachmentFiltering option to configure the Exchange Server behavior on this area.
(http://support.microsoft.com/kb/982639/ )Description of Update Rollup 4 for Exchange Server 2010
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
The BypassOwaXmlAttachmentFiltering option is in the appSettings section in the Web.Config file:
The Web.Config file is in the following location:
<drive>\Program Files\Microsoft\Exchange Server\V14\ClientAccess\Owa
The BypassOwaXmlAttachmentFiltering option lets you disable XML sniffing for attachments.
Note If the value of the BypassOwaXmlAttachmentFiltering option is set to True, you may see the XML context on the attachment.
Important You have to set the .xls file name extension in the Force Save list in the Direct File Access Setting page in the Exchange Management Console to take this hotfix to effect. To set a file type in the Force Save list, follow these steps:
General information about how to configure public computer file access or private computer file access