For Office 2008:
Microsoft site says, "Applies To: Developer Tools, Microsoft Office Word, Microsoft Expression, Microsoft Word 2008 for Mac, Microsoft Office PowerPoint, Microsoft Office Excel, Microsoft Office, Office, Microsoft Entourage, Microsoft Office 2008 for Mac, Microsoft Entourage 2008 for Mac, Microsoft Excel 2008 for Mac, Microsoft PowerPoint 2008 for Mac"
Won't work on Office 2004.