By default, Outlook doesn't automatically download pictures in e-mail messages if the pictures are stored on the Internet. This practice helps to protect your privacy because downloading an Internet picture can alert the sender that your e-mail address is active and that you received the message. However, you can turn off this preference or choose to download Internet pictures only from your saved contacts.
Note: This procedure doesn't affect attached pictures or pictures that are embedded in the body of a message.
On the Outlook menu, click Preferences.
Under E-mail, click Reading.
Under Security, select the option to specify when you want to automatically download pictures from the Internet.