You might want to reply to a message after you read it. The message window enables you to answer a message immediately as you read it. To reply to any given message, follow these steps:
The next time you open a message to which you've replied, there is a reminder at the top of the message window telling you the date and time you sent your reply. Don't forget that the purple arrow next to a message in the Inbox window shows that the message has been replied to.