1. Identifying Task: Can you identify irregularties in the email activity at time ‘xx' and time ‘yy'?2. Comparison Task: Are their any irregularities when you compare email behavior of individual ‘A' with individual `B'?3. Changes Detection Task: How does the email communication of individual `A' change over time?4. Counting Task: How many individuals have sent emails more than 2000 in a calendar year 2001? Who are they?5. Exploratory Task: What happened in each of the year?