- April 16-17: Hackers break into Sony Online Entertainment.
- April 17-19: Hackers break into Sony PlayStation Network and Qriocity.
- April 19: Sony detects an "external intrusion" on its PlayStation Network.
- April 20: Sony shuts down the PlayStation Network and Qriocity.
- April 22: Sony says the networks are affected by "an external intrusion" and that it is investigating.
- April 26: Sony announces that it believes "an unauthorized person" has obtained personal data of PlayStation Network and Qriocity users.
- May 1: Sony Computer Entertainment executives apologize for the breach at a press conference in Tokyo.
- May 2: Sony says Sony Online Entertainment was also affected by a malicious intrusion.
- May 4: Sony provides details of its investigation to a U.S. Congressional subcommittee.
- May 5: Sony CEO Howard Stringer apologizes and offers free identity theft insurance coverage to U.S. customers.
- May 14: Sony starts restoring PlayStation Network services.
- May 16: Sony details 'welcome back' freebies such as games for PlayStation Network customers.
- May 18: Sony temporarily suspends its password change website after discovering a potential security issue. Meanwhile, the company discovers a security breach at its So-net Entertainment Corp. unit, a mobile internet service provider in Japan.
- May 23: Sony says it expects an annual loss of $3.1 billion following the tsunami in Japan and the hacker attacks on its online services.
- May 24: Sony says it has found a security breach affecting 8,500 accounts of a music entertainment website in Greece.
Sony says it has discovered a security breach affecting 8,500 user accounts in a music entertainment website in Greece.
Sony Corp. spokesman Shigenori Yoshida said Tuesday that personal data including names, phone numbers and email addresses may have been stolen. Yoshida said no credit card numbers have been affected.
Sony shut the website on Sunday and is investigating the attack.
Yoshida could not provide further details.
Sony's PlayStation Network system was hacked last month, affecting more than 100 million PlayStation Network, Qriocity and Sony Online Entertainment accounts worldwide and forcing the company to shut down the popular online gaming and video streaming services.
The Japanese maker of PlayStation 3 video game machines and Bravia flat-panel TVs has said it aims to fully restore the service by the end of May.
The company Monday said it spent $170 million to cover costs that included identity theft insurance for customers, improvements to network security, free access to content, customer support and an investigation into the hacking.
Japanese ISP hit
Sony discovered last week that another of its units — a mobile Internet service provider in Japan called So-net Entertainment Corp. had also been attacked.
So-net said that someone gained improper access to user accounts and successfully used so-called "So-net points" to obtain goods worth about $1,225.
It said it discovered the activity late Wednesday after customer complaints and cut off the Internet Protocol address behind about 10,000 attempts to break into the system.
The intruder used points from 128 accounts and illicitly checked the e-mails of 90 users.