I want to clarify whether multiple users are able to feed one master list?
MyMailList & AddressBook is installed just like any other application and the contents of the installation package is deployed in the Program Files. After some searching I've found that the database is stored in the same location. Even if you share it across the network, it's not possible for multiple users to operate it. This requires additional implementation and and direct support from the developers regarding databases (probably SQL). The application lacks these features, but you can request them through the following link: http://www.avanquest.com/USA/group/contact/