Google in the Classroom

I use Google to communicate with my students, but I also love the feature that allows all conversations in a particular thread to stay with one another, rather than creating a new separate message.  This allows me to reference the other conversations or responses within a particular message/question/topic without seeing multiple, separate emails in my inbox.  I also try to keep my email number at a manageable level by filing those emails that I need for future reference and by deleting those that are no longer applicable.