On Saturday, Microsoft confirmed to TechCrunch that hackers could have accessed affected users’ email address, folder names, subject lines, and the names of other email addresses the user communicates with. The company stressed that the content of the emails and attachments weren’t compromised.
According to a Motherboard report, however, the hackers could access the contents from a large number of Outlook, MSN, and Hotmail email accounts. The site’s source witnessed the attack and described it in March, before Microsoft’s statement. The hack was carried out by compromising a customer support agent’s credential.