AFAIK, you cannot automate Outlook Express.
Check out Mailmerge in the Visual Basic Help File. This is the example on
how to automate the mailmerge operation to email
This example merges the document named "FormLetter.doc" with its attached
data document and sends the results to the e-mail addresses stored in the
Email merge field.
With Documents("FormLetter.doc").MailMerge
.MailAddressFieldName = "Email"
.MailSubject = "Amazing offer"
.Destination = wdSendToEmail
.Execute
End With
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Hope this helps,
Doug Robbins - Word MVP