Remember when Valve was hacked last year and they said they found no evidence that hackers took any information? Well, now the company just released this statement yesterday saying that it is "probable" that old backup data was taken.
Recently we learned that it is probable that the intruders obtained a copy of a backup file with information about Steam transactions between 2004 and 2008. This backup file contained user names, email addresses, encrypted billing addresses and encrypted credit card information. It did not include Steam passwords.