To help protect you from potentially inappropriate or offensive images and content in junk email, MSN Mail blocks some images and message previews. By default, MSN Mail blocks messages from appearing in the preview pane if they're from unknown senders and contain words or images you or your family may find inappropriate.
View images from a specific sender
You can have MSN Mail display images only from people who are in your address book or on your safe list.
To add an email address to your safe list so that you can always view images from the sender, click Always show images from this sender.
Unblock message previews
Click the Help & Settings menu, and then click Settings.
In the left pane, click E-mail.
Click E-mail options.
Clear the Don't display potentially offensive content in the preview pane check box.
Click Save Changes.