Serious Security Break at AOL's Network and Systems

AOL just put out the following email:

Dear AOL User,

At AOL, we care deeply about the safety and security of your online experience. We are writing to notify you that AOL is investigating a security incident that involved unauthorized access to AOL's network and systems. Recently, our systems alerted us to an increased incidence of email users receiving spam emails from "spoofed" AOL email addresses. AOL's security team immediately began investigating the cause of the spoofed emails. Spoofing is a tactic used by spammers to make it appear that the message is from you in order to trick the recipient into opening it. These emails do not originate from the AOL Mail system – the addresses are just edited to make them appear that way. AOL is working with other email providers like Gmail, Yahoo! Mail and Outlook_·com to stamp out spoofing across the industry, and we have implemented measures that will significantly limit its future occurrence.