Microsoft 365 Customer Service and Support. The type of support Microsoft provides for consumers depends on the product you're calling about and if you have a product for home or for business use. It can also depend on if you want help for an issue with a service like OneDrive or Outlook.com, or help with Windows, but you don't have an existing ...

Microsoft account. If your account has been hacked, use our sign-in helper tool below to help guide you to the right solutions. The tool will ask for your email address or phone number, and either show appropriate self-help, or offer the chance to talk to an agent.

Add, remove or update an email address or phone number. If you want to make changes to the email addresses or phone numbers associated with your Microsoft account, use our guided support tool below to help you update the right information in the right way.

Follow these steps to reset your Microsoft account password. Follow the steps on this page to change the Microsoft account email address or phone number (also known as your account alias or username) that you use to sign in.

If your system is asking you for your BitLocker recovery key, the following information may help you locate your recovery key and understand why you're being asked to provide it. Important: Microsoft support is unable to provide, or recreate, a lost BitLocker recovery key.

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

Learn how to use your Outlook inbox effectively with Microsoft Support's training resources.

For Business users: To find a customer service phone number in your country, please click a region and find your country. Note: Support cases for Surface devices may only be initiated online.

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

查找 Microsoft 帐户用户名. 如果知道用户名和密码但已停止工作，请阅读 我的用户名和密码已停止工作 。. 如果你忘记了 Microsoft 帐户用户名或电子邮件地址， 并且 之前已在 Microsoft 帐户上设置了其他 安全信息 ，请按照以下步骤操作。. 提示: 如果 尚未 在 ...