I need to be able to send a link to an InfoPath list form to a group of users prompting them to complete by a specific due date. I want to be able to send a reminder to those who have not filled out a form by a specific due date. How can a I check the list and verify who has completed a form or not? I had thought about using a site workflow to send the initial email to the group of users, but verifying who has created an item in a specific list is where I'm stuck. Thanks!