Microsoft 365 outage exposes business reliance on email, calendars, and security systems

Microsoft's global Microsoft 365 outage disrupted Outlook and related services, revealing widespread business dependencies on the platform. The incident affected email, calendars, and authentication systems, causing operational issues for companies and public services worldwide. Exchange Online infrastructure failures impacted calendars, Teams, SharePoint, and Copilot functions. Companies like Autodesk reported clients unable to receive one-time passwords, while UK health services, police, and courts faced communication problems. Air India used alternative channels for customer communications, though flights operated normally. Experts note that banking systems generally remain unaffected due to stricter security requirements, but administrative processes and client communications can suffer. The outage highlights risks of technological concentration, similar to the July 2024 CrowdStrike incident that disabled 8.5 million Windows devices. Organizations are advised to test backup systems and alternative communication paths before emergencies occur.