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 It issues digital certificates, signs certificates to verify their validity and tracks which certificates have been revoked or have expired.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 the official Microsoft licensing terms for Xbox and gaming applications for mobile devices and iPads.

See how to view the details for signatures and certificates.

This cumulative update for Windows 11, version 25H2 and 24H2 (KB5077181), includes the latest security fixes and improvements, along with non-security updates from last month’s optional preview release. To learn more about differences between security updates, optional non-security preview updates, out-of-band (OOB) updates, and continuous innovation, see Windows monthly updates explained ...

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

Learn how to identify and open encrypted and protected emails no matter what email client you're using.

Xbox Support 提供 Xbox、Game Pass 及帳單問題的協助，並在社群中取得建議與客戶服務。

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 ...

If you see error 0x82d60003, you need to use an Xbox-compatible accessory.

This article describes how you can digitally sign a macro project on Windows by using a certificate. If you don't already have a digital certificate, you'll need to get one.