在电脑或 Mac 上下载并安装或重新安装 Microsoft 365 或 Office 2021 - Microsoft 支持
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。
Applies To:
Office 2021, Office 2021 for Mac, Office 2019, Office 2019 for Mac, Microsoft 365 for home, Office for business, Office 365 Small Business, Microsoft 365 admin, Office 365 operated by 21Vianet, Office 365 operated by 21Vianet - Admin, Microsoft 365 for Mac, Office 365 Germany - Enterprise, Office 365 Germany - Enterprise admin, Office.com
Renew Microsoft 365 for personal or family use
Learn how to renew your Microsoft 365 Family or Microsoft 365 Personal subscription online or from a retail store.
Applies To:
Excel for Microsoft 365, Word for Microsoft 365, PowerPoint for Microsoft 365, Excel for Microsoft 365 for Mac, Word for Microsoft 365 for Mac, PowerPoint for Microsoft 365 for Mac, Microsoft 365 for home, Office for business, Office activation
Turn new message alert pop-up on or off - Microsoft Support
See an alert in a pop-up window on the bottom of Windows desktop when new email messages arrive in your Outlook Inbox.
Applies To:
Outlook for Microsoft 365, Outlook 2021, Outlook 2019, Outlook 2016, New Outlook for Windows
Secure messages by using a digital signature - Microsoft Support
A digital signature attached to an email message offers another layer of security by providing assurance to the recipient that you—not an imposter—signed the contents of the email message.
Applies To:
Outlook for Microsoft 365, Outlook 2021, Outlook 2019, Outlook 2016, Outlook 2013
Windows Media Player - Microsoft Support
Learn how to download and customize Windows Media Player. Get troubleshooting help and how-to information for Windows Media Player 12.
Retrace your steps with Recall - Microsoft Support
Search across time to find the content you need. Then, re-engage with it. With Recall, you have an explorable timeline of your PC’s past. Just describe how you remember it and Recall will retrieve the moment you saw it.
Cancel your Microsoft subscription - Microsoft Support
Learn how to cancel your Microsoft subscriptions such as Microsoft 365, Copilot Pro and Xbox. Troubleshoot issues if you can't cancel your subscription.
Applies To:
Microsoft account dashboard
Send, view, and reply to encrypted messages in Outlook for PC
View and reply to an encrypted message without Microsoft 365 using Outlook for PC. If you're not using Outlook with Microsoft 365, your encrypted message will contain a link in the message body.
Applies To:
Outlook for Microsoft 365, Outlook 2021, Outlook 2019, Outlook 2016
Send email on behalf of someone else - Microsoft Support
The delegate then adds the other person's mailbox to their own profile. After that, the delegate can send email on the other person's behalf.
Applies To:
Outlook for Microsoft 365, Outlook 2021, Outlook 2019, Outlook 2016
Create an email signature - Microsoft Support
Training: Watch and learn how to create email signatures in Outlook. Email signatures can include text, images, logos, and more.
Applies To:
Outlook for Microsoft 365, Outlook 2021, Outlook 2019, Outlook 2016