A logical extension of this idea would be the ability to send tasks. That is, say that I'm a teacher and I want to send out an assignment that's due by 6pm the next day to all my students. I should be able to send out a to-do task attached to my email telling my students when the assignment is due, and each student should be able to just click "add to my tasks" and have it integrate with their existing tasks without each student having to manually create a task.