Learn how to reset or change your Microsoft account password. Get help with a forgotten Microsoft account password.

Try these solutions if you can't sign in to your Outlook.com, Hotmail, Live, or MSN email account, or you're not sure how to sign in or sign out.

Update Surface devices and Windows. Download the latest drivers and firmware updates to keep your Surface devices performing their best.

准备好安装了吗？ 在开始之前，请确保电脑或 Mac 满足 系统要求。. 如果你已兑换产品密钥，只需重新安装应用，或者知道你已通过工作或学校分配了许可证，则可以跳到登录部分 ，下载并安装 Microsoft 365 或 Office。 但是，如果是 首次 安装 Microsoft 365 或 Office，可能需要先执行一些步骤。

How to use the IF function (combined with the AND, OR, and NOT functions) in Excel to make logical comparisons between given values.

Learn how to update drivers in Windows using Device Manager to update or reinstall a driver.

Download the latest Windows update from the Windows Update page in Settings for your device when it becomes available.

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

Protect your Android, iPhone, Mac, and Windows devices from threats by installing Microsoft Defender. Download Microsoft Defender on your devices either by:

Use the Office offline installer to install Office 2016 or Office 2013 if you don't have an active Internet connection or you're having problems with slow speed or unreliable connections.