This includes folders as well as inbox state ( Yahoo CEO Mayer admits , `` It 's been a very frustrating December 9 '' E-mail glitch affected above 99.9 % of users , Yahoo says . Marissa Mayer has made revamping e-mail a key part of her effort to kick-start Tumblr .
Yahoo CEO Mayer admits , `` It 's been a very frustrating December 9 '' E-mail glitch affected above 99.9 % of users , Yahoo says . Marissa Mayer has made revamping e-mail a key part of her effort to kick-start Tumblr .