When reading private messages, you'll be presented with a three-column list.
In the "Subject" column will be the subject of the message. Click on it to read the message.
In the "Posted by" column will be the user name of the person who sent the message. You can click on their name to see their profile.
The "Date" column tells when the message came in.
The most recent message will be fully displayed at the top of the page. You may view other messages in your in-box, which are listed below the current message, by clicking on their subject line.
Important: Private Messages in your inbox are automatically expired (i.e. deleted) after 21 days.
Any messages that you receive will be visible in the out-box of the user who sent it to you until you delete it from your inbox or it is automatically expired after 21 days.