  You can list only unread messages by default in all containers. This can cut down the time it takes to see the list of messages when you have a slow connection.
To list only unread messages by default, select "Show only unread items" in your preferences.
When you list only unread messages by default:
• the number of read messages not displayed is indicated on the summary bar (where they are referred to as hidden messages)
• only read messages will be hidden; you will still see other types of messages, such as unsent and sent messages in your Mailbox.
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