>I can use CDO in VFP7 to send emails without any errors. When I use AddAttachment("filename.txt") it works fine with text files as well. However, when I try to send the message with a PDF attachment (which is my need), I get the following error: "OLE IDispatch exception code 0 from CDO.Message.1: The specified protocol is unknown."

Which version of CDO are you using? I have no problem with sending any attachments with CDO 2000.