This article is a technical commentary and implementation example generated using AI. Although the codes and procedures presented are based on primary sources, they have not been verified on actual hardware by the author. Operations may vary depending on the environment and version. Based on official information, this article safely and practically organizes how to build applications utilizing Copilot Cowork and Copilot Studio within a Microsoft 365 environment. It explains the differences in positioning compared to traditional development methods such as VBA or Office Scripts, as well as key points for understanding the overall picture.
1. Introduction and Objective
In utilizing Microsoft 365 and Excel, rapidly building business applications and automation mechanisms is an important topic. Traditionally, VBA, Office Scripts, or manual data organization were mainstream. In recent years, new approaches combining AI and low-code, such as Copilot Cowork and Copilot Studio, have been provided.
The objective of this article is to outline 'building apps in Copilot Cowork and Copilot Studio' as shown in official information, and to clarify its components while comparing it with conventional Excel-related extension methods.
2. Prerequisites and Cautions
The content covered in this paper is based on primary sources such as official blogs, and focuses mainly on explaining feature overviews and concepts at the time of writing.
[Prior to Actual Device Verification] The operations and integration behaviors mentioned in this article are explanations based on official information, and actual device verification on local Windows and Excel environments has not been performed.
When applying external services or Copilot features in an actual environment, check your organization's tenant policies and security settings in advance.
The comparison with traditional methods (VBA and Office Scripts) organizes the philosophies of development approaches and differences in assumed processes, and does not conclude specific processing speeds or superiority.
3. Components of the Overall Architecture
The overall architecture of app building utilizing Copilot Cowork and Copilot Studio is illustrated using Mermaid.
flowchart TD
A[ユーザー・管理者] -->|要件定義・対話| B[Copilot Cowork]
B -->|アプリ・ロジックの連携| C[Copilot Studio]
C -->|データ・操作の統合| D[Microsoft 365 / Excel 環境]
D --> E[従来手法: VBA / Office Scripts]
C -.->|補完・比較| E
As shown in the diagram, it starts with Copilot Cowork, which handles user inputs and instructions, leads to Copilot Studio, which is responsible for orchestration and extension, and connects to Microsoft 365 and Excel as the data foundation. Traditional methods like VBA and Office Scripts exist in parallel as a different layer or as a means of local automation.
4. Overview of Copilot Cowork and Copilot Studio
According to official information, Copilot Cowork and Copilot Studio provide mechanisms for users to create applications and workflows through natural language interaction and flexible customization to address business challenges they face.
Role of Copilot Cowork
Copilot Cowork serves as a starting point for assisting work and shaping application ideas through dialogue with the user. Rather than writing complex code from scratch, it features an approach of organizing requirements in a conversational format and assembling necessary components.
Role of Copilot Studio
Copilot Studio is an orchestration environment for building more advanced customizations, bots, and integration logic. It connects with external data sources and various Microsoft 365 services to define application behavior tailored to business processes.
5. Differences in Approach from Traditional Methods (VBA and Office Scripts)
Traditional automation methods in Excel and Microsoft 365 include VBA (Visual Basic for Applications) and Office Scripts. Here, we outline the differences between these methods and those utilizing Copilot.
VBA: Relies heavily on local Excel files, directly implementing event-driven processing and complex cell manipulations as macros. While advanced control is possible, it has maintenance limitations and constraints in web environments.
Office Scripts: Based on TypeScript, making it suitable for automation in the Excel for the Web environment. Its strengths lie in cloud-based sharing and flow integration.
Copilot Cowork / Copilot Studio: Rather than directly writing code, application frameworks and data integration flows are built through dialogue with AI and the placement of low-code components.
Primary sources indicate that these methods are not entirely mutually exclusive, but rather positioned to be selected and combined depending on the use case, developer skill set, and organizational governance.
6. Key Points and Considerations for Usage
Based on official information, we outline key points to keep in mind when actually evaluating and utilizing the environment.
Clarification of Objectives: VBA or Office Scripts may be suitable for routine numerical calculations in cells or local sheet operations, whereas a Copilot environment should be considered when a natural language conversational interface or integration across multiple services is required.
Permissions and Security: The use of Copilot features and Copilot Studio within a Microsoft 365 tenant requires administrator settings and licenses.
Environmental Differences: Since the range of available features varies depending on the web version of Excel, the desktop version of Excel, or organizational policies, it is necessary to check the latest requirements in official documentation before implementation.
7. Conclusion
In this article, based on official information, we outlined the concept of "Build apps in Copilot Cowork and Copilot Studio" and its differences from traditional methods in Excel and Microsoft 365.
Finally, we summarize the points and constraints that should be verified prior to execution or evaluation for adoption.
[Before Device Verification] The procedures and comparisons described in this article are structural summaries based on primary sources, and their operation in your local environment has not been verified.
When using Copilot Cowork or Copilot Studio, always refer to the latest official Microsoft documentation.
Conduct your evaluation after thoroughly reviewing your organization's security policies, licensing requirements, and data governance constraints.
When comparing with VBA and Office Scripts, it is important to correctly identify the strengths and applicable scope of each technology (local automation versus cloud and AI integration).
