Yahoo Mail users are furious after the company debuted a major resign of the popular email service that eliminated many features and, some claim, left it looking like a knock off of competitor Gmail. Observers say the 'beautiful' new look of Yahoo Mail is a product of new Yahoo CEO Marissa Mayer - and it has backfired. The mail service's 275million users were 'surprised' on October 8 with the redesign and tens of thousands have complained about glitches and reduced functionality. Many simply don't like the look and feel of the new product.