Someone is waiting on a reply, and you do not know who.
The inbox is not a to-do list, but it is doing the job of one. A quote request from Tuesday is now four screens down, under newsletters and a delivery notification, and the only thing telling you it is still open is a feeling you have at eleven at night.
- Ask Bos who is waiting on you, and get an answer from the mail itself.
- Home flags threads that have waited on you for more than 48 hours.
- Mail from your contacts arrives with a reply drafted, waiting for your approval.