Well I said I would be back and hear I am.
I have had this problem ever since I have been using Outlook 2010. When ever I start Outlook mail or send an e-mail I get this little box talking about a security certificate. And it give you a choice of yes or no accepting the certificate, and it don't seem like it makes any diff whitch one you click on, it goes away until the next time. I have viewed the cert. and tried several diff things there, but it still comes back.
I am wondering if this has anything to do with AT&T/Yahoo being my provider, cause I have Yahoo mail also but Outlook is my default mail provder. I want to call someone about this but undecided as to who is the bad guy.
I am attaching a picture of the little box.