Use Follow-ups on Sent E-Mail Messages in MS Out Look
You're probably used to setting follow-up flags on e-mail messages in your Inbox. Until now, though, there wasn't much point setting follow-up flags on sent e-mail messages, because you rarely view your Sent Items folder. Yet it's often useful to set a follow-up flag on a sent e-mail message; for example, a sales e-mail message might warrant following up after a couple of days. It's now worth setting follow-up flags on sent e-mail messages, because they will appear on the To-Do Bar.
To do this:
1. Click the Follow Up flag on the Message tab of the Ribbon when writing your message.
2. Click the follow-up flag you want to use, or set a reminder for the e-mail's recipients.
You can customize the follow-up flag. When you set your flag, some basic options like Today and Tomorrow are instantly available, but if you click Custom, plenty more follow-up options appear. These include start and end times for the follow-up and required activities. All this information will appear on your To-Do Bar