You can upgrade now to the newest Yahoo Mail(Yahoo! Mail Beta) if have the following browser Internet Explorer 7, Firefox 3, Safari 4, or Chrome 5 or newer.
Features of new Yahoo! Mail
• Faster email
• Latest Yahoo! Mail spam-protection technology
• Easier-to-use design
• Unlimited email storage so that you can keep everything you want
Here is the yahoo mail service announcement
Dear xxxxx xxxxxx,
Thank you for being a Yahoo! Mail user for the past 11 year(s). We look forward to bringing you an even faster, safer, easier-to-use Yahoo! Mail very soon.
In the coming months, we will ask you to upgrade to the newest version of Yahoo! Mail for your account x_xxxxxxxxxx@yahoo.com. All Yahoo! Mail customers will be asked to upgrade. But in the meantime, you don’t have to wait, you can have the newest Yahoo! Mail today.
if you do not have one of the above browsers or the newer, you must first update your browser and click this link to upgrade.