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

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 It issues digital certificates, signs certificates to verify their validity and tracks which certificates have been revoked or have expired.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

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Microsoft Viva Insights elements are available in varying levels to users of different Microsoft Office 365 and Microsoft 365 plans. Refer to Environment requirements for Viva Insights and How can I find out what my plan is? for details. Also refer to Outlook add-in prerequisites. The Viva Insights Outlook add-in is an extension of your Microsoft Outlook experience. This add-in works within ...

If you have a Surface or Xbox, you can use your Microsoft account to check its warranty and make warranty claims. Your new Surface or Surface-branded accessory comes with a limited standard warranty. For more warranty details, see Warranty and Protection Plan Terms & Conditions. How to register your Microsoft device for warranty and service Before you can check your warranty or get service ...

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 ...

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Learn how to set up your user account for multifactor authentication with Microsoft 365.

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 The message looks common enough, and it says that money will be charged to your credit card or withdrawn ...