Preview an attachment before you open it (Outlook 2007)
When you receive an attachment in a message and want to quickly see what the attachment contains without opening it, you can preview the attachment in the Reading Pane. Just select the message that has the attachment, and in the Reading Pane, click the attachment once (not twice, which will open it). The content of the attachment, whether it’s a document, a presentation, an image, or whatever, will appear in the Reading Pane.