Hello, I am having trouble with Outlook 2003 SP2. When sending pdf attachments as either plain, html, or rich text, the user gets winmail.dat file attachment. I tried just sending as plain, and that still doesn't work. I check all tools options settings and everything looks fine. What else can I check to get this working. It works for some people, but not all. I send this to someone else and they get the pdf attachment.