BirdBox: Thunderbird on your phone
Allows you to run Thunderbird on an Android device.
Audience: Users or Thunderbird with Android devices. This is a pretty broad user group, but it trends a bit more male and a bit older. They are lovers of free and open source software. They are often programmers, engineers and people in other technical roles. That said, they could be anyone who wants a good email application that isn't made by Microsoft or Google.