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 It issues digital certificates, signs certificates to verify their validity and tracks which certificates have been revoked or have expired.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 ...

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Use the Microsoft 365 Copilot app to create AI-generated images by describing your vision, choosing a style, and customizing size and branding.

Learn how to sign in and create app passwords for Microsoft apps and devices that don't support two-step verification.

The Microsoft 365 (Office) app is now called the Microsoft 365 Copilot app. Get the details about the change and what it means to you.

How to create or edit your Outlook signature for email messages. Include your signature, text, images, electronic business card, and logo.

Contact Microsoft Support. Find solutions to common problems, or get help from a support agent.

Discover how Microsoft Copilot, your everyday AI companion, can help you achieve anything you can imagine.

Try it! Create custom signatures that can be automatically added to your email messages. Email signatures can include text, images, your electronic business card, a logo, or even your handwritten signature. Create an email signature Select New Email. From the Insert section of the ribbon, select Signature > Signatures. Select New, type a name for the signature, and select OK. Under Edit ...

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