Office File Validation, a Microsoft Office 2010 security feature, is now available for both Office 2003 and Office 2007. We strongly recommend that Office File Validation be applied to all computers that use Office 2003 and Office 2007. However, Office File Validation, in combination with Protected View, offers an even better security experience. Protected View is a new security feature that is available only in Office 2010.
For more information regarding Office File Validation for Office 2003 and Office 2007 see the following article on Microsoft TechNet: Office File Validation for Office 2003 and Office 2007.
The Office File Validation Add-in (KB2501584) for Office 2003 and Office 2007 is available on the Microsoft Download Center here.
Ross Carter, CISSP (Office 2010 Security Resource Center on TechNet)