Hello everyone, Thank you all for reaching out to the Community with your feedback and questions on creating a cumulative did not open report! As mentioned in previous responses by other Constant Contact employees, we have recently added a Contacts Segments feature to help with creating a Did Not Open list. This tool allows you to create a list that  did not open report of contacts for the last 90 days or over your last 500 campaigns.  Please continue to share any further feedback on creating a cumulative did not open reports in our feedback section of the Community. ... View more