Unlike previous versions of Microsoft's email client, Outlook 2007 uses Word rather than Internet Explorer to read (or render) the content of HTML emails.

Unfortunately Word does not support the same design features as Internet Explorer so the appearance of emails using these features may suffer some degradation when viewed in Outlook 2007.

This change in how emails are rendered by Outlook 2007 has left many designers and marketers nervously contemplating its impact on email marketing and design.