I get a pretty steady flow of emails throughout the day. They range from very important, to junk email subscriptions that I really need to remember to unsubscribe from. And all too often, I'll get one that I intend to respond to a little bit later, but not while I'm in the middle of writing. Unfortunately that leads to me finding it again a few days later, and kicking myself for forgetting about it. Well, Google wants to help out people like me, who forget to respond to important emails in a timely manner.