Programming Microsoft Office 365 May 2026

The toolkit will generate a project configured for Excel, Outlook, PowerPoint, and Word by default. 3. Build the User Interface (HTML/CSS)

Open VS Code and click the icon in the Activity Bar. Select Create a New App and then choose Office Add-in . Select Task pane as the feature type.

: Use Visual Studio Code as your primary editor. Programming Microsoft Office 365

Before coding, ensure you have the necessary tools installed and an active sandbox environment:

: Found under the "Agents" section in Copilot, this allows you to describe a tool (e.g., "build a signup sheet tracker") and it will automatically generate the schema and UI . The toolkit will generate a project configured for

Use the or Sideload option in the Agents Toolkit to launch the feature in your preferred Office application (e.g., Excel Online or Word desktop).

: You might write a function to get the current selected text in Word and replace it with a generated summary. 5. Sideload and Test To see your feature in action: Select Create a New App and then choose Office Add-in

: Add the Microsoft 365 Agents Toolkit or the Office Add-ins Development Kit from the VS Code Marketplace. 2. Generate the Project Scaffolding