Use voting buttons in messages - Microsoft Support
If you encrypt an Outlook message that contains voting buttons, message recipients won't be able to see them. That feature isn't supported at this time. Create an email message or reply to or forward a message that you received. On the Options tab, in the Tracking group, click Use Voting Buttons.
Applies To:
Outlook for Microsoft 365, Outlook 2021, Outlook 2019, Outlook 2016, Outlook 2013
为由世纪互联运营的 Office 365 设置您的组织 - Microsoft 支持
注意: 本文仅适用于中国的由世纪互联运营的 Office 365。. 作为已注册 Office 365 的管理员，你需要先执行一些重要的设置任务，你的组织中的人员才能使用 Microsoft 365。. 步骤 1：添加用户和域. 步骤 2：安装 Office 应用程序. 步骤 3：设置 SharePoint Online 和 Skype for Business.
Applies To:
Office 365 operated by 21Vianet - Admin