Provide 'Refresh' option just like F5 does on Windows
When your mailbox is really big using 'Unread' smart folder is a great help. But as I mark emails as read there is no way on Mac to refresh the view. This is available on Windows' Outlook version, when pressing F5 refreshes current folder. On Mac I need to switch to another folder and go back to 'Unread' to have the same effect, which is just unnecessary action for user.