This policy setting controls whether pictures from sites in the Trusted Sites security zone are automatically downloaded in Outlook 2007 e-mail messages and other items.
If you enable this policy setting, Outlook 2007 does not automatically download content from Web sites in the Trusted sites zone in Internet Explorer. Recipients can choose to download external content on a message-by-message basis.
If you disable this policy setting, Outlook 2007 automatically downloads content from Web sites in the Trusted sites zone in Internet Explorer.
If you do not configure this policy setting, external content is automatically downloaded for sites in Safe Zones (as defined by Trusted Zones, Internet, and Intranet settings). This behavior is the equivalent to being "Enabled".