Cyberattacks Target Microsoft's Outlook and Cloud Platform in Early June.

Microsoft has confirmed that the early June disruptions to its flagship office suite, including Outlook email and OneDrive file-sharing apps, and cloud computing platform were caused by DDoS attacks by a group named Storm-1359. The attackers used rented cloud infrastructure and virtual private networks to bombard Microsoft servers from botnets of zombie computers around the globe. Microsoft has not disclosed the magnitude of the attacks or the number of customers affected. The company said there was no evidence any customer data was accessed or compromised.