Microsoft released four critical security updates to fix 12 vulnerabilities in various components of its widely used Office program, including Excel and Outlook.

The flaws affects Microsoft Office Excel 2000 Service Pack 3 and Excel 2002 Service Pack 3; Excel 2003 Service Pack 2; Excel Viewer 2003; Excel 2007; Microsoft Office Compatibility Pack for Word, Excel, and PowerPoint 2007 File Formats; Office 2004 for Mac and Office 2008 for Mac. Microsoft addressed the problems by modifying how the program performs validations when opening Excel files.