In a Microsoft Exchange Server 2007 environment, all HTML content in attachment files of messages is run through an HTML filter when you open or save the attachment by using Microsoft Office Outlook Web Access (OWA). Currently, Exchange Server 2007 cannot bypass the HTML filter for customers. This can cause problems for users who use HTML attachments in business and for clients who rely heavily on OWA.
To resolve this problem, install Update Rollup 8 for Exchange 2007 Service Pack 1. For more information about Update Rollup 8 for Exchange Server 2007 Service Pack 1, see the following Exchange Help topic:
After you change the BypassOwaHTMLAttachmentFiltering option, you can bypass the HTML attachments filtering in OWA.
Note You have to set the file extensions of the HTML attachments in the Force Save list in the Direct File Access Setting page in the Exchange Management Console. To set a file type in the Force Save list, follow these steps:
In the Exchange Management Console, click Server Configuration, and then click Client Access.
In the action pane, under Outlook Web Access, click Properties .
Click either the Public Computer File Access tab or the Private Computer File Access tab.
Under Direct file access, select the check box next to Enable direct file access to let users download attachments.
To change the kinds of attachments that you want users to be able to access, click Customize next to Customize direct file access.
On the Direct File Access Settings page, click Force Save. Then, set the file name extensions in the Enter the file extensions you want to force save, one at a time dialog box on the Force Save List page, and then click Add.
Click OK three times to save your settings.
For more information about the BypassOwaXmlAttachmentFiltering option , click the following article number to view the article in the Microsoft Knowledge Base:
950675 A downloaded .xls file attachment is empty when you open the file by using Outlook Web Access on Exchange Server 2007 Service Pack 1