Build 2026: Office 365 Agent Mode Launch, Multi-Agent Cross-Document Collaboration
Microsoft launched Office 365 Copilot Agent Mode at Build 2026, rolling out to M365 subscribers in late June. Multiple persistent AI Agents run simultaneously across Word, Excel, Teams, and Outlook, each maintaining independent context, permissions, and memory. Multi-agent canvas with drag-and-drop chaining. Agents join Teams channels as named participants. Underlying hybrid of GPT-5.5-turbo and Phi-4-mini. Custom Agent Store opens Q4 2026.
