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In the Mail application, the unread mails will be recognized in the bold format in the mails list pane, meanwhile the read mails will be unbold.
The first way
1. Select checkboxes corresponding to messages you want to mark as read.
2. Click More Actions, then select Mark as Read from the drop-down menu.
The second way
This way is used to mark all unread messages in a specific folder.
1. Right-click the folder which contains messages you want to mark as read.
2. Select Mark all as read from the drop-down menu.
After being marked as read, all unread messages inside the folder will be marked as read.
1. Select the messages you want to mark as unread.
2. Click More Actions, then select Mark as Unread from the drop-down menu.