Microsoft Office 2004 for Mac 11.2.4 Update
This update fixes vulnerabilities in Office 2004 for Mac that an attacker can use to overwrite the contents of your computer’s memory with malicious code. This update also fixes issues in Microsoft PowerPoint 2004 and Entourage 2004, and it includes all of the improvements released in all previous Office 2004 updates.
Applies to: Microsoft Office 2004 Standard Edition, Office 2004 Student and Teacher Edition, Office 2004 Professional Edition, Word 2004, Excel 2004, PowerPoint 2004, Entourage 2004.
Released: June, 13, 2006
I have no additional details than what is posted, but my update went well. You can either use the link above or from the Help menu in any Office app.