Document properties, both built-in and custom, are a Microsoft Office-wide feature. The Word 2003 and Microsoft Office Excel expose document properties and provide the same way to work with them. These properties provide a powerful way to add and track specific information for a document.
The Advanced Security for Outlook
from http://www.mapilab.com/outlook/security/ is free Outlook add-in that allows end-user to take control over Outlook security alerts.
If you ever find yourself needing to convert from UNIX time in Excel, here's the solution.