Microsoft has released the Office 2008 for Mac 12.2.6 Update (http://macosg.me/2/ou) that applies to: Office 2008; Office 2008 Home and Student Edition; Office 2008 Special Media Edition; Word 2008; Excel 2008; PowerPoint 2008; Entourage 2008; Office 2008 for Mac Business Edition.
According to Microsoft’s Macintosh Business Unit, the update improves compatibility and stability. For example, It includes fixes for vulnerabilities that an attacker can use to overwrite the contents of your computer’s memory with malicious code.