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 It issues digital certificates, signs certificates to verify their validity and tracks which certificates have been revoked or have expired.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

Find out how to change your Xbox gamertag through a browser, on your Xbox console, or your Windows device.

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

See how to view the details for signatures and certificates.

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Learn all about games and apps for Xbox and get help with any problems you're having.

To learn about digital signatures (also known as digital ID), what they can be used for, and how to them in Word, Excel, and PowerPoint, see All about digital signatures. Create a signature line in Word or Excel In the document or worksheet, place your pointer where you want to create a signature line. On the Insert tab, select Signature Line in the Text group. In the Signature Setup dialog ...

Learn how to use web filtering to protect members in your Xbox family group from seeing inappropriate content online.

Learn how to create and add a signature to your email messages in Outlook Web App.