Question : Mail Merge Works in Office 2003, Fails in Office 2007

I've got a user on Vista running Office 2007.  She has a document to email out to about 900 individuals, and has set-up a mail merge using Word 2007 and Outlook 2007.  She gets through all the steps with no problems, however, it stops sending after about 6 emails.  We can take the same mail merge to another Vista machine running Office 2003 and it runs and delivers the mail successfully.

Has anyone else run into this problem or know how to fix it?

Answer : Mail Merge Works in Office 2003, Fails in Office 2007

Nothing that's been suggested has been successful.  I appreciate the support you''ve given in attempting to solve this problem.  Unfortunately, I'm going to have to continue using Office 2003 for this mail merge project.

I'll be asking an administrator to close this question.