Unfortunately, we are unable to process your request at this time. We apologize for the inconvenience. Please try again later.Strangely enough, this does not affect other email-accounts I have under the same Yahoo!-domain.
It doesn't help my mood very much either, that I have to pay to get a 100MB mailbox with Yahoo - I note runbox has a very attractive 3-year offer for a 2GB mailbox (with runbox.com charging 30% less for it than runbox.no does)