Is it possible to read a mail without changing its style as read?

I mean when we receive a mail (e.g. in yahoo mail) it shows its subject in bold. After reading, the bold style changes to normal one. I want to know is there any way that even after reading, it keeps showing it as unread?Is it possible to read a mail without changing its style as read?after reading it, close it, right click on it and %26quot;mark as unread%26quot;Is it possible to read a mail without changing its style as read?On tne top of the message box click on mark as and then in the dropdown menu click on unreadIs it possible to read a mail without changing its style as read?after reading it, mark it as %26quot;mark as unread%26quot;