Startup Idea: Email Sorting and Management Application

Startup idea to develop a software program that can effectively manage, sort and delete emails based on priority and relevance. The program would prioritize time-sensitive matters, important clients or emails from superiors, distinguish spam from important emails, and integrate with an attorney's calendar.

email - takes way too much time to read and sort/delete. I need a program that can resort the inbox by importance, time sensitive stuff first (i.e. court tomorrow), important clients or e's from boss, communications from clients, get rid of spam without catching important email in the filter, integrate with attorney calendar, etc. yes.