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Microsoft 365 Copilot Blog Today we're expanding model choice in Microsoft 365 Copilot with the addition of Anthropic's latest model—Claude Opus 4 7—now available in Copilot Cowork (Frontier) and Copilot Studio early release cycle environments, and rolling out to Copilot in Excel Opus 4 7 is designed to be faster and more precise, with improved ability to select the right tool for the task It handles complex
March 10, 2026—KB5079473 (OS Builds 26200. 8037 and 26100. 8037 . . . This cumulative update for Windows 11, version 25H2 and 24H2 (KB5079473), includes the latest security fixes and improvements, along with non-security updates from last month’s optional preview release To learn more about differences between security updates, optional non-security preview updates, out-of-band (OOB) updates, and continuous innovation, see Windows monthly updates explained