Microsoft account help and support. Get help with signing in, locked or compromised accounts, linked accounts, closing, reopening, and updating your security info and account profile.

SharePoint Server Organizations can deploy and manage SharePoint Server on-premises or with an Office 365 Enterprise subscription to take advantage of all the latest features.And it offers additional features and capabilities, such as modern site pages, modern web parts and authoring, modern lists and libraries, modern search, integration with PowerApps, Power BI and MS Flow, and SharePoint ...

Communities help you ask and answer questions, give feedback, and hear from experts with rich knowledge.

To find downloads on your PC: Select File Explorer from the taskbar, or press the Windows logo key + E.

如果无法更改密码. 如果无法以这种方式更改密码，请参阅重置 Microsoft 帐户密码。. 需要更多帮助吗？ 请联系支持人员. 有关技术支持，请转到联系Microsoft 支持，输入问题并选择“获取帮助”。 如果仍然需要帮助，请选择“联系支持人员”以转至最佳支持选项。

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public.It issues digital certificates, signs certificates to verify their validity and tracks which certificates have been revoked or have expired.

垃圾邮件和开放中继. 未经请求的商业电子邮件有时称为垃圾邮件或垃圾邮件。 垃圾邮件数量继续增加的main原因是，发送垃圾邮件的人几乎不需要发送任何费用;事实上，发件人甚至不必通过 SMTP (发送垃圾邮件，) 他们自己的 ISP 的电子邮件服务器发送垃圾邮件。

See how Xbox cloud gaming works on Android, Apple, and Windows devices, as well as Xbox consoles and Samsung smart TVs.

Learn how to register your Xbox product so that you can request and track repairs, check your warranty service, and buy an extended service plan. There’s also info on unregistering and unlinking your device.

Advanced email security. As a Microsoft 365 subscriber, you get enhanced security tools that help protect your inbox from phishing and malware.