
Microsoft Routes Excel and Outlook AI Workloads to In-House Models in Push to Cut External AI Costs
Microsoft has begun shifting tens of thousands of weekly AI prompts in Excel and Outlook from OpenAI and Anthropic models to its own internally built MAI systems, Bloomberg reported on July 7. The move marks the first disclosed production-scale migration of Microsoft 365 Copilot traffic away from third-party AI providers, driven by an explicit cost-reduction mandate


































