Get Microsoft billing support. Find help with Microsoft Store purchases, subscriptions, refunds, payment options, and checking your order history.

激活有助于验证你的 Windows 副本是否为正版，且未在超过 Microsoft 软件许可条款所允许数量的设备上使用。 本文将帮助你找出并改正 Windows 中常见的激活错误。

Find everything you need to manage your Xbox account, profile, and more.

Troubleshooting steps for the calling feature of the Phone Link app.

了解如何管理 Microsoft 帐户安全信息和排查验证码问题。

Get support from Microsoft by finding contact options for Canada, including phone numbers and chat sessions.

即使已开启其他防火墙，开启 Microsoft Defender 防火墙也很重要。 它保护你免遭未经授权的访问。 若要打开或关闭 Microsoft Defender 防火墙，请执行以下操作：

了解如何兑换礼品卡、代码或 Office 产品密钥，以及如何在 Microsoft Store 在线商店、Windows 或 Xbox 上花费余额。

Learn how to fix Outlook.com email sync issues if you can't receive or send messages.

Get started with Microsoft Teams (free). Explore your options, find out what’s new, browse help topics, and more.