The theft isn't particularly large and no social security numbers were taken. However, it's one of the few we've seen involving a major PC company's online store. Acer hasn't yet revealed how it happened, but such breaches are usually a result of employees opening infected email, not any fancy hacking. While the breach was still ongoing, Acer recently held an event to reveal its latest laptops and desktop computers. If you bought something from its stores soon after, you may want to ensure that your credentials weren't stolen.