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

Learn how to use mobile operator billing as a payment option to buy Xbox subscriptions, games, and other content.

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

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Here are the most likely causes for an unrecognized charge: A Microsoft subscription has recurring billing enabled. Someone you know, such as a family member, bought something with your card. You can now investigate this on the Manage your payments page. A previously declined charge was charged again. A pre-order or split order was shipped. Someone made an in-app purchase from an app, game, or ...

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.

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 It issues digital certificates, signs certificates to verify their validity and tracks which certificates have been revoked or have expired.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

Use a ready signature template from a gallery to create your email signature in Outlook.

Try these steps if you’re having trouble buying apps, games, or downloads from the Microsoft Store.

How to spot a "fake order" scam A popular tactic of criminals is the "fake order" scam. The way it works is that you get a message, usually in email or text, that appears to be a routine confirmation for an order. Of course, you never ordered whatever product or service it's confirming. The message looks common enough, and it says that money will be charged to your credit card or withdrawn ...