Conversion of XP docs to 2000

Hi,

I have need to convert 200+ documents, spreadsheets, and publisher files that were created using Office XP to be usable by Office 2000. I know that you can open each individual file and "save as" Office 2000 format. Is there anyway to do a "mass conversion" so to speak? I haven't been able to find any kind of solution. Thanks for your help.