Outlook shows the sender's display name in the From field and the only way to see the actual email address is by opening the message, then right-clicking the name and then choosing properties. (Outlook 2002/2003 may show the email address as well as the display name when you open or reply to a message.)
You may be able to see some addresses if you use the Have Replies Sent to field – right click on the row of header names and choose Field Chooser. Choose Address fields from the dropdown where Frequently-used fields is shown. Drag "Have Replies Sent To" to the row of field names. (Choose Custom on the r-click menu if using Outlook 2003 and a multi-line view, then Fields.)
Published September 23, 2003. Last updated on May 16, 2011.