More details, however, are now making the rounds to indicate that the incident was actually worse than explained in the software giant's announcement, as the hackers were even able to read users' emails.
The hacker had access to email accounts from Outlook, MSN and Hotmail between January 1 and March 28, Microsoft said.
Microsoft's Outlook hack is worse than the company originally warned.More news: Musk Tweets Tesla Will Make Over 500000 Cars in 12 Months
Microsoft confirmed during the weekend that cybercriminals managed to compromise the account of a support agent and then access users' email accounts.
It transpires that some users have been sent a notification from Microsoft informing them that hackers were able to access the content of emails.
In our original story, we shared the email that Microsoft was sending out to those who had been affected by the attack, explaining that hackers had only been able to access a limited amount of information. Paid-for, enterprise accounts were unaffected-only consumer accounts were hit. "Please be assured that Microsoft takes data protection very seriously and has engaged its internal security and privacy teams in the investigation and resolution of the issue, as well as additional hardening of systems and processes to prevent such recurrence".More news: Portland takes Game 1 against Oklahoma
Microsoft was forced to revise its statement after Motherboard found that the attackers had full access to email content.
The company did not state how many people were affected, but said it was "a limited number of consumer accounts". The company did say that potential hackers could only read full email content for about 6% of affected Outlook users.
Despite the perpetrators not gaining access to account passwords, Microsoft is still recommending that if you've been affected, you should change your password just as a precautionary measure.More news: Jet Airways pilots threaten strike amid more flight cancellations