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public.It issues digital certificates, signs certificates to verify their validity and tracks which certificates have been revoked or have expired.

Is it available on my device? BitLocker encryption is available on supported devices running Windows 10 or 11 Pro, Enterprise, or Education. On supported devices running Windows 10 or newer BitLocker will automatically be turned on the first time you sign into a personal Microsoft account (such as @outlook.com or @hotmail.com) or your work or school account.

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注意: 如果使用 Microsoft 帐户 （例如 Outlook.com 、Hotmail、Live 或 MSN 电子邮件帐户）而不是工作或学校帐户登录，请注销，然后使用正确的帐户重新登录。 不确定使用哪个帐户登录？ 在 Outlook 导航标头中选择 “帐户管理员 ”。 如果未使用所需帐户登录，请选择“ 注销 ”并重新开始该过程，或选择 ...

Learn how to get your Xbox device serviced. Important Send in your device as soon as possible. If you don’t ship your device within 30 days of your request, your service order will be canceled, and the shipping label will no longer be valid.

Data sources. Your first step in setting up a mail merge is to pick the source of data you'll use for the personalized information. Excel spreadsheets and Outlook contact lists are the most common data sources, but if you don't yet have a data source, you can type it up in Word, as part of the mail merge process.

If you can't sign into your Microsoft account, most issues can be identified by our sign-in helper tool. The tool will ask you to enter the email address or mobile phone number you're trying to sign in with and check the details you provide.

Important: You don't need to remove old security information unless there is an account security risk (e.g. someone else has access to your old mailbox).

在文件夹窗格中查找共享邮箱. 在左侧的文件夹窗格中，找到“ 与我共享” 文件夹。 单击文件夹以将其展开。 共享邮箱是“ 与我共享”下的子文件夹。在其中选择共享邮箱的名称时，它将展开以显示标准电子邮件文件夹，例如 “收件箱”、“ 草稿”和 “已发送邮件”。

Learn how to join a Microsoft Teams meeting if you don't have an account. Join a Teams meeting as a guest in the Windows app or on the web.