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

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

If you already redeemed a product key, reinstalling the apps, or you have an assigned license through work or school, you can skip ahead and go to the section sign in to download and install Microsoft 365 or Office.

Starting in 2024, many new devices are preinstalled with new Outlook for Windows and the classic Outlook app isn't included.

注意 Microsoft Authenticator 不适用于 电脑或 Mac，因为验证器应用是出于安全原因为智能手机设计的。 了解详细信息。 Microsoft不再支持超过一年的 Authenticator 版本。 始终使设备保持最新状态。 中国用户应 了解如何在中国下载和使用 Microsoft Authenticator。

The Microsoft Authenticator app helps you sign into your accounts when you're using two-step verification.

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

Need help with an Xbox console, an Xbox game, or Xbox network? Find out how to get in touch with us.

Troubleshoot slow game or app downloads on Xbox One Account error occurs when signing in to Xbox network

Errors CAA2000B, 4usqa, and 49dvs when trying to sign in to classic Outlook and Outlook for Mac