When you receive an email message you need to reply to, or when someone is asks you to do a task, you can have Outlook remind you to follow up. Here's how to do it:
1. Right-click on the email message
2. In the menu, mouse over "Follow Up", and click "Add Reminder"
3. You can customize it to remind you to follow up, send a reply, call, etc.
4. Click the box next to "Reminder", and set the date and time to have Outlook remind you to take action.
5. Click the OK button.