Training: Get started with SharePoint in Microsoft 365. At office.com, sign in to SharePoint, then select the SharePoint tile.

Find out how to troubleshoot issues redeeming XBOX digital codes and gift cards.

检查 XBOX 服务、游戏和应用是否有任何服务中断。

Support for Windows 10 has ended on October 14, 2025. Learn more about your options for Windows 10.

另请参阅 如果这些步骤不起作用，或者你遇到其他帐户登录问题，请使用我们的 登录帮助程序工具。 Microsoft 帐户安全信息和验证代码 如何帮助保护 Microsoft 帐户的安全 更改或重置 Windows 密码 访问去世用户的帐户 需要更多帮助吗？ 无法登录？ 如果无法登录到Microsoft帐户，大多数问题都可以通过 ...

Learn how to activate Windows using a product key or digital license, check your activation status, and link your Microsoft account.

如果在电脑上安装或更新游戏服务时遇到问题，或者你注意到电脑版 XBOX 应用启动时缺少内容，则可能需要下载并运行适用于电脑的游戏服务修复工具。

需要有关 XBOX 主机、XBOX 游戏或 XBOX 网络的帮助?了解如何与我们联系。

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 It issues digital certificates, signs certificates to verify their validity and tracks which certificates have been revoked or have expired.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

Hotmail is now Outlook.com. Learn how to sign in to access your Outlook.com, Hotmail, Live, or MSN email account.