Verified answer

This has been a full day of major snaffu's within the Yahoo Mail domain--- this site has literally "lit up" over the last five to six hour with posts into the hundreds over this thing !!

Rumor (Yahoo still hasn't made an official statement as far as I know) is that it is a server problem and possibly having to do with the " time change differential " in some way !!

There have been a number of posts from people who say that Yahoo is coming back slowly and that THEIR service has returned in the last little while

Odd thing is--- I have not lost service at all ---all day--- and my mail is operating like a sewing machine as we speak !!

Have patience and hopefully you'll be back up and running in no time here !!!

same problem here, I tried 2 different yahoo mail accounts, 3 different browsers, a system reboot, disabling firewall and so on..

nothing worked..

time to switch to another email service maybe?

Mine just came back online 5 minutes ago after 8 hours downtime. Try again, if not, try this link: http://us.m.yahoo.com/

Just try opening it again later.