About This Article
This article was generated using an automated workflow powered by generative AI. It reviews Microsoft's official Japanese pricing and feature comparisons as of September 13, 2026, and provides a guide on how to choose between Microsoft 365 Copilot Chat and Microsoft 365 Copilot Business.Verification Status: 📘 Confirmed via official Microsoft documentation – Contracts/actual devices not independently verified
The difference between Microsoft 365 Copilot Chat and Copilot Business goes beyond a simple "free versus paid" distinction.It becomes much easier to decidebased on whether you only need AI chat centered around web searches and local files, or if you want Copilot integrated directly into your actual work in Word, Excel, Outlook, and Teams.
Step 1: Inventory Your Tasks in Three Lines
Before looking at the subscription screen, try pasting the following table into Excel and marking it with circles and crosses.
| Check | Question |
|---|---|
| □ | Is your work primarily focused on web research and file summarization? |
| □ | Do you want to use Copilot while editing Word, Excel, or PowerPoint documents? |
| □ | Do you want to ground AI responses in business data, including Outlook and Teams? |
If the first point is your main focus, you have room to start with Copilot Chat. If points 2 and 3 are central to your daily work, you should consider Copilot Business.
Look at "Where You Use It," Not Just the Price
According to the official Microsoft website, Copilot Chat is available within supported Microsoft 365 environments, whereas Copilot Business requires a separate qualifying Microsoft 365 plan. In the Japanese pricing display confirmed on September 13, 2026, Copilot Business was listed at an equivalent of 2,698 JPY per user per month with annual billing. Because prices and promotions are subject to change, always recheck the official page before purchasing.
With Copilot Business, you can use Copilot directly within applications like Word, Excel, PowerPoint, Outlook, and Teams. Connecting with your work data via Work IQ is a major differentiator in your selection.
Key Focus Areas
The most important factor in a comparison is not merely "how smart the AI is."
Chat中心 -> Copilot Chatから検証 Office内作業中心 -> Copilot Businessを比較 業務データ連携 -> 権限・情報保護も含めて設計
Particularly for administrative roles, the decisive factor is whether you want assistance within the context of the Excel sheet or Outlook message you are currently working on, rather than creating an Excel table and pasting it into a separate screen.
Adjusting One Variable
Suppose you start with the assumption of rolling out the paid version to all 20 employees.Try changing that firstto just 5 high-frequency users.
全員導入 -> 役割別パイロット -> 利用ログ/業務時間を確認 -> 拡大判断
This simple change shifts your deployment decision from "AI seems convenient" to "which specific tasks justify the cost."
For Business Use
Compare options by defining three specific use cases per job role—such as meeting minutes, notification drafts, and Excel aggregation for general affairs; Outlook, Teams, and proposal materials for sales; or inquiry sorting and internal information retrieval for IT support. Rather than uniformly rolling out paid licenses to low-frequency users, it is often easier to evaluate by splitting roles between Copilot Chat and paid licenses.
Additionally, check your SharePoint and Teams access permissions before deploying Copilot. This does not mean the AI will bypass security permissions;information that users already have access to becomes much easier to discover via AI,making it worthwhile to fix over-sharing issues beforehand.
Summary
Copilot Chat and Copilot Business can be effectively chosen by evaluating not just price sheets, but whether your needs center on the web/files, in-app Office usage, or business data integration. It is safest to start small with defined tasks and expand licenses where tangible benefits are observed.
Official and Primary Sources:
Microsoft 365 Copilot Plans and Pricing: https://www.microsoft.com/ja-jp/microsoft-365-copilot/pricing
Microsoft 365 Copilot Chat: https://www.microsoft.com/ja-jp/microsoft-365-copilot/chat
