To make sure you do not forget about a message, you can use the follow-up feature.
Select one or more messages.
Right-click one of the messages.
Click Mark for Follow Up….
You can also do this by selecting the message(s) and clicking Message ▸ Mark as ▸ Follow Up… or by pressing Shift+Ctrl+G.
A window opens to allow you to set the type of flag and the due date.
The flag itself is the action you want to remind yourself about, such as Call, Forward and Reply.
After you have added a flag, you can mark it as complete or remove it entirely by right-clicking the message and clicking either Flag Completed or Clear Flag.
When you read a flagged message, its flag status is displayed at the top, before the message headers. An overdue message might tell you "Overdue: Call by April 07, 2012, 5:00 PM."
Flags can help you organize your work in a number of ways. For example, you might add a Flag Status column to your message list and sort that way. Alternately, you could create a search folder that displays all your flagged messages, then clear the flags when you're done, so the search folder contains only messages with upcoming deadlines.
If you prefer a simpler way to remind yourself about messages, you can mark them as important by right-clicking the message, then click Mark as Important, or by selecting Message ▸ Mark as ▸ Important from the menubar.
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