A report by the Cyber Safety Review Board, mandated by President Biden, has criticized Microsoft for its handling of a Chinese hack in Summer 2023 that targeted the email accounts of top U.S. government officials, including Commerce Secretary Gina Raimondo, through the Microsoft Exchange Server and Exchange Online. The report details a series of 'avoidable errors' by Microsoft that led to the breach, highlighting a 'cascade of errors' in the company's security practices for cloud-hosted email accounts. The board's findings indicate that the intrusion, which compromised tens of thousands of email servers, was preventable and criticized Microsoft for not knowing how the Chinese attackers carried out the hack. The report calls for an overhaul of Microsoft's security culture, stating that the company's response was inadequate. This breach, part of a larger hacking campaign, has raised significant concerns about cybersecurity practices at one of the world's leading tech companies.