Outlook 2003 and I believe 2002 does not let you unblock attachments. Microsoft's way of protecting us from ourselves. Our Exchange Server is set to block a few more file types than even Outlook and the attachment is stripped before sending so I have gotten into the habit of zipping everything up and then attaching. Most compression programs like Winzip add a few options to the context menu, so all I have to do is right click the file I want to send, choose Zip and E-mail file, and the file will be zipped and automatically added as an attachment to a new e-mail. *.zip are not blocked by Outlook and most people have Winzip or some other compression program installed, so they would only have to double click or open the attachment, let Winzip do its thing, and save the unzipped file.