The pushpin icon suggests that these items were created using a custom form.
That's going to affect how (or rather whether) they can be exported to Excel.
You can check the Properties dialog of the folder to see if it's set up to
use a custom form. To find out the name of the custom form, add the Message
Class field to the current view and examine those items.
You may need to consult
http://www.outlookcode.com/article.aspx?ID=39 for
scripts and tools to change the message class or
http://www.slipstick.com for
tools to export custom form data.
--
Sue Mosher, Outlook MVP
Author of Microsoft Outlook 2007 Programming:
Jumpstart for Power Users and Administrators
http://www.outlookcode.com/article.aspx?id=54