I just set up a new computer with Office XP. When I try to e-mail an Excel file or a Word file (or any file made by a Microsoft Office application) Outlook will not send the message. It never leaves the outbox. I can send other file types however. I've tried, pdf, jpg, and they all work fine. But when I try sending xls or doc files nothing moves. I don't think this is a security feature because I can receive those files. I'm thinking something in Outlook is blocking these but I can't find it.