Yahoo! Japan announced on May 17th night [J] that they found that their account management server got raided, a file having 22 million of their user account names left on the server.
The announcement said that they can not deny the possibility of the file transferred to outside of the company’s network. However, as the file did not include any other information such like password, secret questions for password recovery, etc., they wrote that those public account name disclosed will not cause serious trouble such like others log in your account.
[Update] Reuters report it.
[Update 2013-05-20] PC Advisor and Information Week followed. These do not tell that Yahoo! Japan’s ID is totally irrelevant with U.S. Yahoo ID. (i.e. you can not log in U.S. Yahoo with Yahoo! Japan’s ID, and vise versa.)
