If you use non scripted access to yahoo mail classic with a certain browser version, with javascript and active x disabled, you may have noticed that you cannot get into your mail box. Instead of your mail classic inbox/home page, you get NOTHING... just a blank page with a DONE in the status bar.. This blank page is caused by a software upgrade advertisement/promotional jump page that yahoo decided to put between you and your mail box, in efforts to promote users to upgrade to internet explorer 8.0.. The promotional page requires the use of Javascript, in order to load the ie8 upgrade page, that also contains another link to your inbox. To get into your mail box, you have to click the link within the advertisement/promotional IE8 upgrade page that says, "NO THANKS, GO TO MY INBOX" or something similar to that.. If you do not have Java script enabled, you won't see this page, and won't be able to access your yahoo mail classic inbox...

To get back into your mail box, open internet options, select "security" click on the "internet" globe icon, then select custom level; set your browser scripting behaviour to "prompt" then try to log into mail.yahoo.com, enter your login info, click login, then when it prompts you to allow scripts, click yes, then you will get the IE 8.0 upgrade page. Find and click the no thanks, go to my inbox link, then you should be good to go. You can then disable scripts/prompting and should be able to log out, then log back in, and access yahoo mail classic, like normal, without javascript, or the annoying ie8 upgrade jump page.