Depending on how you got your copy of Windows 10 or Windows 11, you'll need either a 25-character product key or a digital license to activate it. A digital license (called a digital entitlement in Windows 10, Version 1511) is a method of activation in Windows 10 and Windows 11 that doesn't require you to enter a product key. Without one of these, you won't be able to activate your device.

Learn how to fix problems signing into your Microsoft account. Resolve password verification, locked account, and other Microsoft account login issues.

PC Health Check app brings you up to date info on your Windows device health, helping you take action to improve your device performance and troubleshoot performance problems. It is periodically updated based on customer feedback to help you make the most of your Windows PC.

Contact Microsoft Support. Find solutions to common problems, or get help from a support agent.

PC 版 Game Pass 计划让你可以在 Windows 10/11 设备上畅玩一组高质量的电脑游戏。 体验 PC 版 Game Pass 的最佳方式是使用适用于 Windows 的 Xbox 应用，可从 Microsoft Store 或以下位置下载：

请按照以下步骤重置你的 Microsoft 帐户密码。. 你尝试在 Xbox One 主机或 Windows 10 设备上下载和安装某游戏时，看到以下错误代码和消息：. 0x80073CF3. 请等待几分钟，然后重试。. 更新失败。. 这说明你的主机或 Windows 10 设备上已存在该游戏的现有版本。.

了解 Xbox X|S、Xbox One、Xbox 360 和 Windows 10 上的 Call of Duty（使命召唤）、如何购买该游戏以及从哪里可获取疑难解答帮助。

Phishing and suspicious behavior. Outlook 2021 Outlook 2021 for Mac Outlook 2019 More... A phishing email is an email that appears legitimate but is actually an attempt to get your personal information or steal your money. Some deceptive emails appear to be from a safe sender but, in fact, have a "spoofed" source address to fool you.

所有 Xbox 数字代码长度均为 25 个字符，包括数字和字母，并且采用五组字符（每组包含五个字符）格式 (xxxxx-xxxxx-xxxxx-xxxxx-xxxxx)。 如果你尝试在 Windows 或 Xbox 设备上兑换代码，请确保已正确输入所有 25 位数字。 详细了解 Xbox 数字代码和礼品卡，以及如何解决兑换内容的问题。

Discusses how to remove viruses, spyware, rogue software, or malware using Microsoft Security Essentials, Microsoft Safety Scanner and Microsoft Defender Offline.