Cannot access my yahoo email account? can access other services, but does not open the email account?

it happened today. left my computer on and connected to the Internet. Came back after 12 hours to find that cannot log into my yahoo mail. it says the page does not exist.

Cannot access my yahoo email account? can access other services, but does not open the email account?
because u have overused it.LOL.
Reply:You'll see this message if it has been more than 12 hours since u last signed into YMail and u did not click the "Sign Out" link at the end of ur session. Yahoo display this message and ask that u log in again as a safeguard for YMail user. ^_^
Reply:I am having the same problem. I suspect a Yahoo server or two are down. This happened a couple of months ago, too. If it's not up in the morning I will call customer service.
Reply:you need to refresh the page. then re-enter your user name and password. this is a security provided by most services. for example in the 12 or so hours so were away from your system anyone could have used your email. think about it..