Customize the integration to map Salesforce fields to MailChimp Merge Variables

During install, optionally upload MailChimp Subscribers as Salesforce Leads

Turn on an hourly sync so changes in Salesforce data are copied over to MailChimp subscribers

Upload email addresses to MailChimp from Lead and Contact list views

See Subscriber detail and full MailChimp activity by clicking the View More links

Individually manage Subscriber preferences from Contact and Lead page layouts

See MailChimp Campaign details and Campaign Share Reports

If you turned Lead creation on, new MailChimp Subscribers will become new Salesforce Leads