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public.It issues digital certificates, signs certificates to verify their validity and tracks which certificates have been revoked or have expired.

Billing & payments. Your dashboard is also where you can: Buy, renew, or cancel a subscription.

Notes: You can either use an email address you own as a Microsoft account, or create a new address by choosing "Get a new email address" or "Use your email instead" when you sign up.

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安装 Windows 11. 在针对你的特定电脑测试和验证 Windows 11 升级后，Windows 更新将指示它已准备好安装。 若要检查 Windows 11 是否已为你的设备准备就绪，请转到“开始” “设置” >“更新和安全性” >“Windows 更新” ，然后选择“检查更新”。 如果升级适用于你的设备，并且想要继续，请下载并安装它。

Email与 Microsoft 帐户关联的地址和电话号码称为别名，它们使用相同的联系人、在线存储、订阅和帐户设置。 可以使用任何别名登录到 Microsoft 服务或 Windows 和 Xbox 设备，并且可以选择其中任何一个来发送和接收电子邮件。

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Always check the sender's email address and confirm that it makes sense for the message you've received. 2. To whom it may concern. If they don't know your name, they can't withdraw any funds from your bank account.

Press the Start button on the taskbar, type settings, and then select Settings.; On Windows 10, select Update & Security.On Windows 11, select Windows Update.; On the Windows Update page, select Check for updates to see if any updates are available for your device.; Once the updates have downloaded, select Install now to start the installation.; Following installation, we recommend that you ...