Microsoft offers updates for Office 2004, 2008 and the Open XML converter. The update for Office 2008 corrects bugs and a handful of faults, the 2004 update is only concerned with security breaches. More info and to download them:
Update Microsoft Office 2008 for Mac 12.2.3
Update Microsoft Office 2004 for Mac 11.5.6
Open XML File Format Converter for Mac 1.1.3
