Email conversation style, with an integrated workflow.

solve starred jump bug
scroll to right of new message autocomplete
Sideways gloss on the avatars
autoarchive

Show all unread or received_at > 1.day.ago

Star conversations not messages
Task with name/date?

Later:

Attachments
Navigation shortcuts
Receive all DMs
Search
Favorites
Activity
Contacts

Types

Everything - archives after a day
Starred - todo list
Activity feed - broadcast emails