This blog will cover the following points:
- Introduction
- What Microsoft Actually Did — and Why It Matters
- Why Claude Inside Copilot Changes the Power Platform Equation
- What This Means for Japan-Based Operations Specifically
- The Data Residency Question You Cannot Ignore
- How to Adjust Your Power Platform Strategy Now
- Conclusion
Introduction
For years, Microsoft Copilot meant one thing: OpenAI. The two companies were so closely tied that most enterprise buyers assumed the relationship was permanent and exclusive. That assumption is no longer accurate.
Since January 2026, Anthropic’s Claude has been enabled by default inside Microsoft 365 Copilot for most commercial tenants worldwide. In March 2026, Microsoft went further, announcing Copilot Cowork, its flagship agentic automation tool, built on Claude’s technology. This is not a minor vendor update. It is a structural shift in how Microsoft thinks about AI inside its enterprise stack.
For foreign companies running Power Platform workflows in Japan, this shift has immediate, practical consequences for automation strategy, reporting architecture, governance, and how you brief your IT teams in Tokyo.
What Microsoft Actually Did — and Why It Matters
The move unfolded in stages. In September 2025, Microsoft added Claude models to Copilot as an optional, opt-in backend. By January 2026, that changed: Anthropic became a default-enabled subprocessor for most commercial tenants, covered under Microsoft’s own Product Terms and Data Processing Agreement.
The centrepiece came in March 2026 with the announcement of Copilot Cowork as part of Wave 3 of Microsoft 365 Copilot. This cloud-based AI agent executes multi-step tasks across Outlook, Teams, Word, Excel, PowerPoint, and SharePoint on a user’s behalf. Under the hood, it runs on Anthropic’s Claude.
The strategic logic is clear. As Microsoft’s president of its Business and Industry Copilot division stated at the announcement, Copilot will continue to be powered by OpenAI’s latest models, and customers now have the flexibility to use Anthropic models too. This is not a replacement. It is a multimodel orchestration platform, where Claude handles complex reasoning and document-heavy tasks while other models handle simpler requests.
For Microsoft partners and enterprise customers, this means the AI layer inside every Power Platform tool you already use has become significantly more capable overnight.
Why Claude Inside Copilot Changes the Power Platform Equation
The practical impact spans the tools that Japan-based Microsoft partners use every day.
Power Automate can now route complex, document-heavy workflows to Claude within the Copilot layer, without a separate API integration. Approval flows, contract review steps, and bilingual document processing can tap Claude’s reasoning directly inside a Copilot Studio agent, with governance and audit trails maintained by Microsoft’s own infrastructure.
Power BI gains a more capable natural language interface. Claude’s strength in maintaining context over long, data-dense documents makes it particularly well-suited for generating narrative commentary on dashboards, which is exactly what finance and operations teams in Japan need when reporting to European or North American headquarters in English.
Copilot Studio now lets developers select Claude as the underlying model when building specialised agents. This is significant for Japan-specific use cases where document complexity, bilingual requirements, and nuanced instruction-following matter more than raw speed.
The ability to connect Claude to structured organisational data, including SharePoint lists, Teams channels, approval flows, and document libraries, without leaving the Microsoft ecosystem is genuinely powerful. Most enterprises already have this data. They simply have not had an intelligent interface into it until now.
What This Means for Japan-Based Operations Specifically
Japan-based operations at foreign companies are disproportionately document-heavy. Vendor contracts, compliance reports, bilingual correspondence, and approval workflows generate exactly the kind of long, structured content where Claude’s large context window and precise instruction-following create measurable value.
Three areas stand out for Japan operations teams:
Bilingual document workflows. Claude can analyse lengthy Japanese-language documents, generate English summaries, and write back structured output to SharePoint or Business Central records, all within a Power Automate flow that requires no new software licenses beyond what you already hold.
Approval and compliance chains. Japan’s consensus-based decision culture creates multi-step approval workflows that most global automation templates are not built for. Claude inside Copilot Studio can be configured to summarise pending approvals, flag compliance issues, and draft recommendation notes in both Japanese and English before routing to the next approver.
Headquarters reporting. Finance teams can ask Power BI questions in plain language and receive Claude-generated narrative analysis alongside their dashboards, reducing the gap between data and the explanations that headquarters actually needs.
The Data Residency Question You Cannot Ignore
For any company operating in a regulated Japanese environment, one technical detail demands attention before expanding Claude usage inside Copilot.
Standard Microsoft 365 Copilot processing for Japan tenants has been available for in-country processing, meaning prompts and responses can be handled within Japanese data centres. However, Anthropic models are explicitly excluded from those in-country processing commitments. Any request routed through Claude, including Cowork task execution, falls outside that data residency guarantee. Data is transferred from Azure to Anthropic’s servers in AWS or GCP datacentres located primarily in the United States.
This does not mean Claude-powered Copilot features are off-limits for Japan operations. Anthropic operates as a Microsoft subprocessor under Microsoft’s Product Terms and Data Processing Agreement, which means your enterprise data is not used to train Anthropic’s models. But for companies subject to strict data sovereignty requirements or internal policies about data leaving Japan, this is a governance decision that must be made deliberately rather than by default.
Your IT and compliance teams in Japan need a clear answer on this before deployment scales.
How to Adjust Your Power Platform Strategy Now
The Claude-Copilot integration does not require a new strategy. It requires an updated one. Three practical steps for Japan-based Microsoft partners and their clients:
First, audit which existing Copilot Studio agents and Power Automate flows would benefit from Claude’s reasoning capabilities, particularly those handling long documents, bilingual content, or multi-step approvals. These are the highest-value candidates for upgrade.
Second, review your data residency posture with your Microsoft partner. Understand which workflows will route through Anthropic models by default, and which need to remain on standard Copilot processing to meet your compliance requirements.
Third, treat this shift as a Business Central and Power Platform opportunity. If your ERP data in Dynamics 365 Business Central is already connected to Power BI and Power Automate, adding Claude-powered analysis inside Copilot Studio is an incremental step, not a new project.
Conclusion
Microsoft’s decision to build Claude into the core of Copilot, and to power its flagship agentic product on Anthropic’s technology, signals that the multimodel AI era inside the Microsoft stack is here. For Japan-based operations running on Power Platform, Dynamics 365, and Microsoft 365, this is not something to monitor from a distance. It changes what your existing tools can do today.
The opportunity is real, and so is the governance responsibility. The companies that benefit most will be those that approach both with the same care.
Sysamic K.K. is a Tokyo-based Microsoft Dynamics 365 partner helping European and North American companies get the most from the Microsoft stack in Japan. We implement Business Central, Power Automate, Power BI, and Copilot Studio with full attention to Japan’s compliance environment, bilingual requirements, and the operational realities that global templates miss. If you are rethinking your Power Platform strategy in light of these changes, we would be glad to help, email us at info@sysamic.com or fill out our contact form here to get in touch.