Learn how to create and save a passkey to sign in to your Microsoft personal or work/school account and many other websites, apps and services.

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Certificate authority (CA) A certificate authority is an entity similar to a notary public. It issues digital certificates, signs certificates to verify their validity and tracks which certificates have been revoked or have expired. Top of Page Digital signature assurances The following terms and definitions show what assurances are provided by digital signatures. Authenticity The signer is ...

Support for Windows 10 has ended on October 14, 2025. Learn more about your options for Windows 10.

About digital signatures and certificates in Office, and buying a digital certificate from a certificate authority or create your own.

Org Explorer helps you visualize and explore your company's internal structure, its teams, and the people around you. Use the search function to find people and learn more about them. Want to know more about reporting structures within your company? Org Explorer gives you a comprehensive overview of managers, roles, titles, peers, and more.

Learn how to install the Microsoft Copilot mobile app on your iPhone or iPad and use the apps with Microsoft 365.

Learn how to sign in to Office or Microsoft 365 from a desktop application or your web browser.

Learn how to find a Windows product key for activation, and when you'll use a digital license instead.

Planner Agent in Microsoft Copilot is a specialized agent for intelligent work and task management. Built on top of advanced Planner AI capabilities, it brings Planner’s intelligent task and plan management directly into the core Copilot chat experience. With Planner Agent, you can: Create, update, and manage your tasks and plans Ask questions about your work and tasks Take action on tasks ...