Claude is Down? Microsoft 365 Outage Disrupts AI Tools

Microsoft’s global outage has stretched into a second day, disrupting email, workplace tools and AI platforms tied to Microsoft 365, with nearly 130,000 Outlook outage reports in the US, more than 38,000 Microsoft 365 issue reports and disruptions across 74 countries. Users attempting to access connected AI tools, including Claude, have also been affected as the incident ripples through services that depend on Microsoft infrastructure. The event matters because it highlights how concentrated cloud and productivity dependencies can cascade into AI platforms and the businesses that rely on them. What to watch next is whether Microsoft restores services and discloses a root cause, and whether affected AI providers report their own downstream impact.