Get help and support, whether you're shopping now or need help with a past purchase. Contact Microsoft Support. Find solutions to common problems, or get help from a support agent.

Activate Microsoft 365 or a non-subscription version of Office. When you start an Microsoft 365 app that's not activated, you'll be prompted to sign in to Microsoft 365. Be sure to sign in using the Microsoft account, or work or school account, that you used to buy or subscribe to Microsoft 365.

I need to talk to a customer support agent. Learn how to get Microsoft account help, troubleshoot sign in issues, keep your account secure, and manage your Microsoft account dashboard.

如果您有争议并且我们的客户服务代表无法解决，请通过美国邮政将争议通知寄给微软公司，收件人：LCA ARBITRATION, One Microsoft Way, Redmond, WA 98052-6399, USA。

For help from an agent, follow the Get help link below to chat or request a call—we’ll call you so you don’t have to wait. For even faster help, search for your topic on our site.

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

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

Office 2021 and Office LTSC 2021 are the next perpetual releases of Office. They include improvements over Microsoft Office 2019 and earlier versions of on-premises Office. For more information, see the following frequently asked questions.

Reduce the size of pictures and attachments in Outlook email messages. Send large files by using file sharing, cloud services, or other solutions for working around file size limits in Outlook.

如果这是你 第一次 安装 Microsoft 365，则可能需要先执行一些设置步骤。. 展开下面的 “了解详细信息”部分。. 但是如果是重新安装 Microsoft 365，且已兑换了产品密钥并拥有与 Microsoft 365 相关联的帐户，请转到“ 登录并安装 Office ”的部分。. 提示: 如果你是小型 ...