Microsoft 365 services including Outlook, Microsoft Defender and Microsoft Purview were impacted on Thursday, with the company issuing an update on the matter.

Why is Microsoft 365 not working and which services and apps are down? Microsoft 365 faced an outage on Thursday affecting Outlook, Teams, Defender, Purview, and Store. Users reported the ‘451 4.3.2 Temporary server error’.

Microsoft Defender Researchers uncovered a multi‑stage AiTM phishing and business email compromise (BEC) campaign targeting multiple organizations in the energy sector.

Organizations operating in today’s regulatory environment face increasing pressure to demonstrate compliance with various industry standards and government regulations. From healthcare to finance, companies must navigate complex compliance requirements while maintaining operational efficiency and security posture.

What is Microsoft 365 451 4.3.2 Temporary Server Error and how to fix it? Microsoft 365 faced outages affecting Outlook, Teams, Defender, and Purview. Users reported over 11,000 issues. The error indicates server-side problems.