What’s New in Microsoft 365: September 2025 The summary of key updates and enhancements in Microsoft 365 in September 2025 Copilot Fix spelling and grammar faster with Microsoft 365 Copilot in Word for the web Now you can apply all grammar and spelling corrections simultaneously in Word for the web! Read more. Availability: This feature is currently rolling out to Word for the web users. Copilot Copilot-powered file previews coming to Microsoft 365 Copilot app for iOS Microsoft is making ...