An investigation of this year's Home Depot hack reveals it wasn't just millions of credit card numbers that were stolen – millions of email addresses were pilfered, too. Along with credit card numbers stolen from Home Depot earlier this year, investigators said that a great amount of email addresses were taken, too.

A joint investigation of law enforcement officials, Home Depot representatives and independent security analysts found that no "passwords, payment card information or other sensitive personal information" was held in the stolen files which contained the customer email addresses. The investigation report detailed how the hack occurred.