The Campaign Overview report shows a list of all campaigns in your system. It includes the following data for each campaign:
Target audience size, estimated cost, and estimated response rate. The data that appears here is not calculated by the reporting engine – it is the information that was entered in the Properties tab for this campaign by the person who created it.
The number of people who elected a global opt-out as a result of receiving an e-mail from this campaign. Note that you would have to include a landing page link to a page including a global-opt out form, and event that would track the submission of that form, for the report to be able to show this data.
You can click the name of any campaign in the list to go directly to the Email Campaign Details report for that campaign.