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 It issues digital certificates, signs certificates to verify their validity and tracks which certificates have been revoked or have expired.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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Alpha Skip-Ahead Ring (2606.260416-2200) Hey Xbox Insiders! We are releasing a new Xbox Update Preview to the Alpha Skip-Ahead ring today. Continue reading below to learn all about what's included with this update.

This article has guidance for: Organizations with IT-managed Windows devices and updates.

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

瞭解如何針對您嘗試同步處理 Xbox 遊戲儲存時的雲端儲存錯誤進行疑難排解。

Discover the differences between Microsoft 365 Copilot Chat and Microsoft 365 Copilot — explore features available with and without a license.

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

Important: With two-step verification, you always need two forms of identification. This means that if you lose your phone, your password alone won't get you back into your account. For that reason, we strongly recommend you have three different sign-in methods associated with your account.

Check the Xbox services, games, and apps for any service outages.