Once you send a message, you tend to forget it, even if you're waiting for feedback from the recipient. Don't let those messages fall through the cracks. Track them using a follow-up flag.
- Flag the sent message: Right-click the sent message, choose Follow Up, and click Add Reminder.
- Flag a message before sending it: Click the Follow Up button on the toolbar. Choose an appropriate flag or Add Reminder. (In Outlook 2007, click the Message tab and click Follow Up in the Options group.)