Collecting Data from Custom Outlook Form

I'm able to pull out standard information from an outlook email (such as Subject, Received, and Sent by) but I would like to capture data from fields on a Custom Form that is published at the Enterprise Level. Does anyone know how to identify the fields in VB so I can pull the information into Excel? The majority of these custom fields are Checkboxes to the data I should get is "True/False, or "0/-1"

Thanks in advance for you help.