> ## Documentation Index > Fetch the complete documentation index at: https://docs.cassidyai.com/llms.txt > Use this file to discover all available pages before exploring further. # Install the Microsoft Office extension > Access your Cassidy Agents in Microsoft Word, Excel, and PowerPoint to generate content, edit files, and answer questions without leaving the app. The Cassidy Microsoft Office extension brings your [Agents](/agents/overview) into Word, Excel, and PowerPoint. Draft and rewrite documents, analyze and edit workbooks, generate and refine slides, and tap into your company's [Knowledge Base](/knowledge-base/overview) — all from a side panel inside each app. A single installation enables Cassidy in all three apps. ## Install the extension Go to the [Cassidy Microsoft Office extension](https://appsource.microsoft.com/en-us/product/office/WA200008195) in the Microsoft Office Store. Cassidy extension listing in the Microsoft Office Store Click **Get it now** to begin the installation process. If you're not already signed in, you'll be prompted to log in to your Microsoft account before continuing. Microsoft sign-in prompt during Cassidy extension installation A confirmation dialog shows your account information. Verify you're signed in with the correct account and click **Get it now**. Click **Edit your details** if you need to make changes. Microsoft account confirmation dialog with a Get it now button A dialog asks if you'd like to install Cassidy for Word, Excel, and PowerPoint. Click **Continue** to proceed. Installation confirmation dialog with a Continue button Once installed, you'll see the Cassidy icon in the toolbar of Word, Excel, and PowerPoint. You can also find it through each app's **Add-ins** menu. Cassidy icon visible in the Word toolbar Cassidy listed in the Add-ins menu in Word The first time you open the extension in any of the three apps, you'll be prompted to sign in to your Cassidy account. Signing in once covers Word, Excel, and PowerPoint. Cassidy login screen inside the Microsoft Office extension side panel ## Use Cassidy in Word Open the Word document you want to work with. Click the **Cassidy** icon from your toolbar or the Add-ins menu. The Agent opens in a side panel. A prompt is automatically populated in the chat box based on your document, giving you a starting point. You can ask the Agent to draft new content, rewrite a section, summarize the document, or answer questions using your [Knowledge Base](/knowledge-base/overview). Cassidy Agent side panel in Word with a suggested prompt for document editing Once you're happy with the generated content, click **Add to Document** to insert it directly into your Word document. ## Use Cassidy in Excel Use Cassidy in Excel when you want an Agent to help with the workbook you have open. Ask questions about your data, fill in spreadsheet answers, build charts, and more. Excel workbook with a chart created by a Cassidy Agent in the side panel Select the cell or range you want the Agent to work with. Cassidy shows your current Excel selection above the chat box so you can confirm the Agent has the right context. Excel workbook with a selected range shown in the Cassidy side panel Click the **Cassidy** icon from your toolbar and ask for the outcome you want. For example, ask the Agent to answer RFP questions, generate data insights, or create a chart. Cassidy side panel in Excel with a prompt asking the Agent to plot revenue versus net income If the Agent needs to change your workbook, Cassidy shows an approval card before applying the edit. Review the pending edits, then choose **Allow once**, **Allow all edits**, or **Deny**. Cassidy approval card in Excel with Allow all edits, Allow once, and Deny options Use the edit permission button in the chat toolbar to choose how Cassidy handles future workbook edits. Select **Ask before edits** when you want to review each change, or **Accept all edits** when you want the Agent to apply edits without asking again in that chat. Excel extension edit permission dropdown with Ask before edits and Accept all edits options ## Use Cassidy in PowerPoint Use Cassidy in PowerPoint when you want an Agent to help with the deck you have open. Generate new slides, rewrite copy, restructure bullets, draft speaker notes, and ask questions about your presentation — all without leaving PowerPoint. PowerPoint presentation with a slide edited by a Cassidy Agent in the side panel Select one or more slides in the thumbnail panel, or click a shape on a slide, when you want the Agent to focus on a specific part of the deck. Cassidy shows your selection above the chat box, and the Agent always has visibility into your full deck so it can place new slides in the right spot. PowerPoint with selected slides shown in the Cassidy side panel Click the **Cassidy** icon from your toolbar and ask for the outcome you want. Common prompts: * Polish the selected slide's wording, structure, and visual clarity * Add a new slide to this presentation about a given topic * Summarize this presentation Cassidy side panel in PowerPoint with a prompt to tighten bullets on the selected slide Before changing your deck, Cassidy shows an approval card describing what the Agent wants to do. Choose **Allow once**, **Allow all edits**, or **Deny**. Cassidy approval card in PowerPoint with Allow all edits, Allow once, and Deny options Use the edit permission button in the chat toolbar to choose how Cassidy handles future deck edits. Select **Ask before edits** when you want to review each change, or **Accept all edits** when you want the Agent to apply edits without asking again in that chat. PowerPoint extension edit permission dropdown with Ask before edits and Accept all edits options ## Next steps Customize the Agent your extension uses with instructions, knowledge, and capabilities. Add company documents so your Agent gives accurate, context-aware answers in Word, Excel, and PowerPoint. Install Cassidy extensions for your entire team from the Microsoft 365 admin center.