what is the info sign on some opened emails?

[Guest]

on some of my opened emails, both sent and rcv'd, next to the open envelope,
there is a small round information sign (circle with and exclamation mark
inside).
What does this mean?

 

[Christian Goeller]

liddy, you wrote on Wed, 15 Feb 2006 09:20:27 -0800:

on some of my opened emails, both sent and rcv'd, next to the open envelope,
there is a small round information sign (circle with and exclamation mark
inside).
What does this mean?

http://www.howto-outlook.com/howto/icons.htm