My VB6 application uses CR XI. It can send PDF attachments via MAPI compliant email systems. My client uses Thunderbird, a Mozilla email system, which is IMAP V4 and POP3 compliant. Is there a way to configure the host Windows system so my application will work with Thunderbird? I am familiar with the ".DestinationType = crEDTEMailMAPI" and ".DestinationType = crEDTEMailVIM" methods.