Continuing support for Office 2004, the Microsoft Office 2004 11.5.8 Update addresses seven security vulnerabilities surrounding maliciously crafted Excel files that could enable an attacker to run arbitrary code and gain system user rights; accounts with administrative rights are at a greater risk than accounts with fewer privileges. The update addresses these issues by changing the way certain Excel files are parsed. It is rated Important for Microsoft Office 2004 for Mac and requires that you've previously installed the Microsoft Office 2004 for Mac 11.5.7 Update. The update is available from Microsoft's Web site and via the Office 2004 version of Microsoft AutoUpdate. (Free, 9.7 MB)