"We have identified that a Microsoft support agent's credentials were compromised, enabling individuals outside Microsoft to access information within your Microsoft email account" between Jan. 1 and March 28," Xinhua quoted Microsoft as saying in the email.
The unauthorised access could have allowed unauthorized parties to view or access information of Microsoft email user accounts, such as email address, folder names, and the subject lines of emails, it said.
"Microsoft regrets any inconvenience caused by this issue," said the company, recommending that affected users reset their login passwords.
The company assured its users that it has immediately disabled the compromised credentials to prevent their use for any further unauthorised access.
Microsoft has offered contact information for its data protection officer to help possible hacking victims to better protect their email accounts.
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)