Yahoo Danger on 12/18/2010?

[Nikolaj]

I don't know, so I am only asking- I went to check my yahoo mail, and I got an odd security message that the 'certificate could not be verified', I clicked on 'view certificate' which said it expires on Jan. 4. 2011 and 'is not yet verified', so I hit 'Cancel' and didn't proceed further. E-mail will have to wait a bit, I guess. Or, is this nothing to be concerned about?
Thanks.