Microsoft is not unique in claiming the right to read users’ emails – Apple, Yahoo and Google all reserve that right as well, the Guardian has determined.The broad rights email providers claim for themselves has come to light following Microsoft’s admission that it read a journalist’s Hotmail account in an attempt to track down the source of an internal leak. But most webmail services claim the right to read users’ email if they believe that such access is necessary to protect their property.
http://www.theguardian.com/technology/2014/mar/21/yahoo-google-and-apple-claim-right-to-read-user-emails