Microsoft has started notifying some Outlook.com users that hackers can access their accounts earlier this year. Microsoft has claimed that hackers can view their account email addresses, folder names and titles. Microsoft has found that the credentials of the support agent for the webmail service have been compromised and unauthorized access to some accounts from January 1, 2012 through March 28, 2019. It is not an e-mail or an attachment.
It is not clear who is affected by this violation or who has gained access to an Outlook.com e-mail account. "Microsoft's data showed that account-related information (not the content of the e-mail) could be displayed, but Microsoft did not know why or how to use the information."
Hackers did not steal login details or other personal information, but with caution, Microsoft encourages affected users to reset their passwords. "Microsoft is sorry for the inconvenience this has caused." "Microsoft takes data protection very seriously and is confident that its internal security and privacy team has been involved in the investigation and resolution of the issue as well as further strengthening of systems and processes to prevent such recurrence."
It has been weeks since the former security researcher found guilty of hacking Microsoft and Nintendo's servers. Microsoft's Windows development server was compromised for several weeks in January 2017, allowing hackers across Europe to access pre-release versions of Windows.
Microsoft confirmed this violation in a statement on The Verge but the company did not specify how many accounts were affected .
April 13 12:05 PM Eastern Time  Microsoft spokesperson addressed this scheme, which affected some restricted client accounts by disabling risky credentials and blocking access by perpetrators : Updated article with Microsoft Knowledge Base