New messages are received when you log on, at automatic intervals that you set, and on-demand when Check Mail is clicked.
You can set the new messages polling intervals from the Options>Mail tab. The default is every 5 minutes.
To receive new messages immediately, click Get Mail on the toolbar. You automatically go to the Inbox view.
You can spot unread mail messages by looking for folders with a bold name and a number in parentheses next to the folder name. For example, Inbox (22) indicates that there are a total of 22 unread messages that are contained within conversations that appear in your Inbox.
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