Office 2008 for the Mac Service Pack 1 is available. http://www.microsoft.com/mac/downloads.mspx?pid=Mactopia_Office2008&fid=395D1487-A3A6-4106-A0F8-4D6E1D6D89D2#viewer
This update contains several improvements to enhance security, stability, and performance, including fixes for vulnerabilities that an attacker can use to overwrite the contents of your computer's memory with malicious code. For detailed information about this update, please visit the Microsoft Web site.
Microsoft Security Bulletin Summary for May 2008