Yahoo CEO Marissa Mayer admits , `` It 's been a very frustrating week '' E-mail glitch affected 1 % of users , Yahoo says . Score: 7
Yahoo CEO Marissa Mayer admits , `` It 's been a very frustrating week '' E-mail glitch affected 1 % of users , Yahoo says . Mayer has made revamping e-mail a key part of her effort to kick-start Yahoo .