Download details: Office 2003/XP Add-in: Remove Hidden Data:
"With this add-in you can permanently remove hidden data and collaboration data, such as change tracking and comments, from Microsoft Word, Microsoft Excel, and Microsoft PowerPoint files."

Thanks to WinXPnews at http://www.winxpnews.com

http://www.microsoft.com/downloads/details.aspx?FamilyID=144e54ed-d43e-42ca-bc7b-5446d34e5360&displaylang=en