Running enterprice 12 soon 14, I have started working with the e-mail marketing app. I want to send out newsletters to my existing customers and was expecting that it was possible to integrate to my existing database. Fo now I am using Mailchimp which works brilliant but I would rather use my address book to assign interest for newsletter instead of importing a list and have a new database to maintain.
Anyone knows if it is possible to use the good old, existing database for mass mailing?

Thanks 

/Michael