Allow users to HIDE emails in inbox until a pre-scheduled date, when they would re-appear with red flag at top of inbox
In my experience most users use the Inbox as a "messy to do list" - they scan up and down the list of hundreds of mails every day to spot things they need to follow up on - very inefficient and a major contributor to the "email overload" feeling.
It would be great if I could click on a "calendar" icon on my email and schedule a future date at which the email would re-appear at the top on my inbox flagged with a special "for action" flag - so I knew it was something that I needed to follow up on, but would not have to think about it of have it clogging up my inbox until I actually needed to.
A typical example is the email I send to someone saying "could you get this to me by Wednesday" - if I BCC myself on my sent emails, I can then immediately schedule the copy in my inbox to vanish, and then reappear at the top of my inbox on Thursday morning.
This would be a fantastic help to making the Inbox a day to day to-do list