Microsoft has confirmed a data breach by unknown hackers who might have been successful in accessing a ‘’limited’’ number of Microsoft customer’s Email.

According to the company, hackers breached the Microsoft network between January 1 and March 28 and compromised the Microsoft support agent’s credentials.

Microsoft sent an email notification to all their customer via stating, “This unauthorized access could have allowed unauthorized parties to access and/or view information related to your email account (such as your e-mail address, folder names, the subject lines of e-mails, and the names of other e-mail addresses you communicate with), but not the content of any e-mails or attachments”

The company has confirmed the incident to TechCrunch that account of users of services like @msn.com and @hotmail.com had been compromised in the recent breach, but the exact number of victims is not known. 

“We addressed this scheme, which affected a limited subset of consumer accounts, by disabling the compromised credentials and blocking the perpetrators’ access,” said a Microsoft spokesperson in an email.

Microsoft is urging all its affected users to change their passwords immediately.