Help, Guides, and News on making the Switch To Apple Macintosh Computers
"This update contains several updates to enhance security and stability, including fixes for vulnerabilities that an attacker can use to overwrite the contents of your computer's memory with malicious code. In addition, this update includes all of the improvements released in all previous Office 2004 updates."
Owners can get the update by kicking off the Microsoft AutoUpdate application that resides in your OS X Application folder or by going to Help -> Check for Update in any Office 2004 application.
The update applies to Office 2004 Standard Edition, Office 2004 Student and Teacher Edition, Office 2004 Professional Edition, Microsoft Word 2004 for Mac, Microsoft Excel 2004 for Mac, Microsoft PowerPoint 2004 for Mac, and3Microsoft Entourage 2004 for Mac.
You can read about the update at the MacBU blog or you can be download the update here.