Microsoft 365 Service Updates for August 18-24, 2025

The provided service updates from Microsoft 365 detail a range of upcoming changes and new features across various products, with most updates rolling out between August and October 2025. Key themes include enhancements to Copilot's AI capabilities in apps like Word, Excel, and Teams, as well as security improvements such as DNS provisioning changes, secure boot certificate updates, and new external sender tags in Outlook. Several updates also focus on streamlining user experience and administrative control in platforms like Teams, SharePoint, and Viva Engage, alongside retirements of older features like the "Share to Teams" experience in Outlook and OneNote for Windows 10 support. Administrators are frequently advised on necessary actions or awareness items, ensuring smooth transitions and continued secure, efficient operation.