Windows 8.1 - Prevent the Mail from Marking Unread Messages as Read

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You may have noticed that the Mail app of Windows 8.1 automatically marks selected unread messages as read. To prevent this from happening:
  • Open the Mail app.
  • Press CTRL + C to open the Charm bar
  • Click on Settings > Options.
  • Toggle When an unread message is selected mark it as read off