MailChimp has announced the launch of a new desktop application to help email marketers manage complex list segmentation.

Hairball is an Adobe Air application that allows users to import their MailChimp account data onto their desktop computers and build as many segments as they’d like within the offline app. After the list segments are completed, Hairball re-syncs with MailChimp online and creates new static segments inside the application for sending campaigns.

Hairball has been tested with lists of up to 10 million email addresses and for accounts with over two years sending history. The application was created in part to meet the needs of MailChimp’s largest senders – currently sending over 40 million emails each month.

To use Hairball, customers must first install Adobe Air and then download the app from MailChimp.