Microsoft has begun to notify some Outlook.com users that hackers can access their accounts earlier this year. The company found that the credentials of the supporting agent were compromised by its webmail service, allowing unauthorized access to certain accounts between January 1 and March 28, 2019. Microsoft said the hacker may have viewed the email account, including the folder name and subject line, but did not include the content of the email or attachment.
It's unclear how many users are affected by hacking or who is participating in an Outlook.com email account. In this intrusion, hackers could not steal login details or other personal information, but for caution, Microsoft recommends that affected users reset their passwords.
“Microsoft regrets any inconvenience caused by this issue,” Microsoft said. “Please rest assured that Microsoft places great emphasis on data protection and allows its internal security and privacy team to participate in investigations and problem resolution, as well as to further strengthen systems and processes. Prevent such events from happening again. ”
The security incident occurred a few weeks after a former security researcher admitted to invading Microsoft and Nintendo servers. In January 2017, Microsoft's Windows development server was devastated for weeks, allowing hackers across Europe to access pre-release versions of Windows.