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 It issues digital certificates, signs certificates to verify their validity and tracks which certificates have been revoked or have expired.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

Xbox Support offers help for Xbox, Game Pass, and billing questions. Get advice and customer service in the Xbox Support community.

Don't forget to include your license ID or agreement number, your contact phone number & email address so we can contact you. If you already have a volume licensing support case number, you may be in a location where you can phone the Volume Licensing support team.

Microsoft Support is here to help you with Microsoft products. Find how-to articles, videos, and training for Microsoft Copilot, Microsoft 365, Windows 11, Surface, and more.

Find out how to resolve your Xbox purchase error when you’re trying to buy something from the Microsoft Store.

You can access another person's mailbox if you have been granted the appropriate permissions to their mailbox. Permissions can range from read-only to creation, deletion, and allowing responses to messages.

Whenever you access, change personal info in, or add new contact info to your Microsoft account, we generate a security code and send it to either an email address or a mobile phone number in your account security info.

A phishing email is an email that appears legitimate but is actually an attempt to get your personal information or steal your money. Some deceptive emails appear to be from a safe sender but, in fact, have a "spoofed" source address to fool you. Here are some ways to deal with phishing and spoofing scams in Outlook.com. Spoof intelligence in Exchange Online Protection helps prevent phishing ...

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How to add a signature to your Word documents. You can also use the Signature Line command in Word to insert a line to show where to sign a document.