What’s new in Microsoft 365 Copilot | September 2025

Microsoft 365 Copilot is getting smarter every day, and the September 2025 updates are some of the biggest yet. If you’ve ever wished for an assistant that could take on complex tasks across your apps, you’re in for a treat. This month’s enhancements are all about making AI more interactive, personal, and powerful.

We’re seeing the introduction of groundbreaking features like Agent Mode and the Office Agent, which are set to redefine how you work. These aren’t just small tweaks; they represent a significant step forward in making AI a true partner in your daily tasks. Let’s explore the exciting Microsoft Copilot new features for 2025 and what they mean for you.

Agent Mode: Your New AI Teammate

Imagine having an AI agent that doesn’t just respond to commands but works on tasks for you. That’s the idea behind the new Microsoft 365 Copilot Agent Mode.

Initially available in Excel and Word, Agent Mode allows you to give Copilot a goal, and it will work iteratively to achieve it. For example, you could ask it to analyse a dataset in Excel and create a summary report. The AI agent will perform the necessary steps, asking for clarification only when needed. This is made possible by integrating advanced models like GPT‑5 and Anthropic’s Claude, making the AI more adaptive and intelligent.

This is a game-changer for productivity, automating complex workflows that used to take hours. Keep an eye out for its integration into PowerPoint later in 2025.

Office Agent in Copilot Chat: Assistance Across Apps

Tired of switching between apps to get things done? The new Office Agent feature in Copilot Chat is here to help. This enhancement provides seamless, cross-app support, allowing you to work across Word, Excel, PowerPoint, Outlook, and OneNote without leaving the chat interface.

For instance, you could ask the Office Agent to pull data from an Excel spreadsheet, create a chart, and insert it into a PowerPoint presentation. It understands the context across your different files and apps. This feature has started rolling out in the U.S. and will be available globally soon, with desktop expansion plans in the works.

Copilot Chat Gets a Major Upgrade

The Copilot AI enhancements for September 2025 bring a more powerful and integrated chat experience directly within your Microsoft 365 apps. You no longer need to switch to a separate window to get AI assistance.

Here’s what’s new:

• Expanded App Integration: Copilot Chat is now deeply embedded in Word, Excel, PowerPoint, and OneNote, following its July release in Outlook.
• File and Image Understanding: Copilot can now understand the content of your files, including Word documents, Excel sheets, and PDFs. It can even analyse and interpret images within these files, allowing you to ask questions about charts or diagrams.
• Multi-File Context: You can reference multiple files in a single prompt, allowing Copilot to synthesise information from different sources to answer your questions or create new content.

Copilot Library: Organise Your AI Creations

With AI helping you create more content than ever, keeping track of it all can be a challenge. The new Copilot Library, rolling out in October, provides a central hub to manage all your AI-generated content.

Initially, the library will support images and Copilot Pages created in Copilot Chat. Everything is synced across your devices, making it easy to find, edit, and share your creations. For admins, the library will offer insights into how AI is being used across the organisation.

Read this: Top 20 Microsoft Copilot Prompts of 2025

Copilot on the Go: Mobile App Enhancements

Your AI assistant is becoming more powerful on mobile devices. The latest updates bring key desktop features to your phone or tablet:

• Agent Store: Access and use specialised AI agents directly from the Microsoft 365 mobile app.
• PDF Summarisation: Copilot can now analyse and summarise PDF documents natively on mobile, making it easy to get key information from long reports.
• Copilot Search and Memory: Premium users get access to Copilot Search and the new Copilot Memory feature, which personalises your AI experience by remembering your preferences and context.

Smarter Spreadsheets with Excel Formula Completion

Let’s be honest, writing complex Excel formulas can be tough. Copilot is making it much easier with AI-powered formula completion. As you start typing a formula, Copilot will analyse the context of your worksheet and suggest relevant completions in real time.

This feature, which rolled out to Excel on the Web in September, helps you write, debug, and optimise formulas faster and with fewer errors.

Personalise Your Experience with Copilot Memory

Copilot Memory allows your AI assistant to learn from your past conversations and preferences to provide a more personalised and contextual experience. It builds a knowledge base based on your interactions and Microsoft Graph data.

You have complete control over this feature. You can view, clear, or disable your memory at any time, ensuring your privacy is always protected.

Go Premium for Advanced AI Tools

For those who want to take their productivity to the next level, Microsoft has launched the Microsoft 365 Premium plan for $19.99 per month. This subscription unlocks exclusive features, including:

• Researcher, Analyst, and Actions tools: Advanced AI agents designed for specific, complex tasks.
• Higher Copilot usage limits: More access to your AI assistant when you need it most.
• 1 TB of cloud storage and enhanced security with Microsoft Defender.

Your AI-Powered Future Awaits

The September 2025 updates for Microsoft 365 Copilot mark a huge leap forward in making AI an indispensable part of our daily work. From intelligent agents that automate tasks to a chat experience that works across all your apps, these tools are designed to make you more productive, creative, and efficient.

We encourage you to explore these new features as they roll out. Discover how they can transform your workflow and share your feedback to help shape the future of AI in productivity.

Read Also:

• Top 10 Things to Try First with Microsoft 365 Copilot
• Microsoft Copilot vs Copilot Pro: Which one to choose?
• How to Use Microsoft Copilot for Data Analysis in Excel