Obtain a digital certificate and create a digital signature
About digital signatures and certificates in Office, and buying a digital certificate from a certificate authority or create your own.
Applies To:
Excel for Microsoft 365, Word for Microsoft 365, Outlook for Microsoft 365, PowerPoint for Microsoft 365, Word 2024, Word 2021, Word 2019, Excel 2016, Word 2016, Outlook 2016, PowerPoint 2016, Office 2016
Secure messages with a digital ID in Outlook - Microsoft Support
Signing your email messages with a digital ID helps to prove your identity and prevent message tampering.
Applies To:
Outlook for Microsoft 365, Outlook 2024, Outlook 2021, Outlook 2019, Outlook 2016, New Outlook for Windows
Microsoft 365 高级版帮助 & 学习
Microsoft 365 高级版是面向 1 到 6 人的订阅，其中包括所有个人 AI 功能提供的最高使用限制。 每人最多 6 TB 的云存储空间 (1 TB) 、强大的生产力和创造力应用、数据和设备的高级安全性，以及持续的客户支持。
Advanced capabilities with premium plans in Planner
How to use the advanced capabilities of Planner's premium plan and how to upgrade to the premium plan.
Applies To:
Microsoft365.com, Microsoft Office, Microsoft Planner, Microsoft Teams
AI credits and limits for Microsoft 365 subscriptions
Last updated: April 2026 Introduction to AI credits and limits Microsoft 365 Personal, Microsoft 365 Family and Microsoft 365 Premium plans include the latest AI features to power your productivity and creativity. Some of these features have limits to the number of times they can be used within a specific time period while others require the use of AI credits. Limit and AI credit allotments ...
Applies To:
Microsoft365.com
Microsoft 365 Premium help & learning
Microsoft 365 Premium is a subscription for one to six people that includes the highest usage limits available on all personal AI features ¹, up to 6 TB of cloud storage (1 TB per person), powerful productivity and creativity apps, advanced security for your data and devices, and ongoing customer support.
How to add and change an email signature in Outlook
How to create or edit your Outlook signature for email messages. Include your signature, text, images, electronic business card, and logo.
Applies To:
Outlook for Microsoft 365, Outlook 2024, Outlook 2021, Outlook 2019, Outlook 2016, Office for business, Office 365 Small Business, Outlook on the web, Outlook.com, Microsoft Office, New Outlook for Windows, Outlook on the web for Exchange Server 2016, Outlook on the web for Exchange Server 2019
Microsoft 365 和 Office 2024 之间的区别是什么？
Microsoft 365 是一种订阅服务，可确保你始终拥有最新的 Microsoft 新式生产力工具。 存在针对家庭和个人、中小型企业、大型企业、学校以及非营利组织的 Microsoft 365 计划。 Microsoft 365 个家庭或企业计划 现在包括 Copilot，将 AI 支持的功能引入你最喜欢的桌面应用，如 Word 、 PowerPoint 和 Excel 。 Microsoft 365 ...
Applies To:
Office 2024, Office 2024 for Mac, Office 2021, Office 2021 for Mac, Office 2019, Microsoft 365 for home, Microsoft365.com
Access included as part of Microsoft 365 and Office 365 subscriptions
Microsoft Access is now included as part of Microsoft 365 Business Standard and Business Premium subscriptions.
Applies To:
Access for Microsoft 365
Create an email signature from a template - Microsoft Support
Use a ready signature template from a gallery to create your email signature in Outlook.
Applies To:
Outlook for Microsoft 365, Outlook 2024, Outlook 2021, Outlook 2019, Outlook 2016, Microsoft Office