About digital signatures and certificates in Office, and buying a digital certificate from a certificate authority or create your own.

Certificate authority (CA) A certificate authority is an entity similar to a notary public. It issues digital certificates, signs certificates to verify their validity and tracks which certificates have been revoked or have expired. Top of Page Digital signature assurances The following terms and definitions show what assurances are provided by digital signatures. Authenticity The signer is ...

您也可以在簽名中新增社交媒體圖示和連結，或自定義我們預先設計的其中一個temlates。 如需詳細資訊，請參閱 從範本建立簽名。

How to create or edit your Outlook signature for email messages. Include your signature, text, images, electronic business card, and logo.

Learn how to create and add a signature to your email messages in Outlook Web App.

Create a custom signature block with a picture and social networking icons to add as a new signature for your email messages.

Explore Ask, create, and draft with Copilot, plus your favorite apps and content in one place. Find the information you need to build, run, and grow your small business with Microsoft 365. Visit Small business help and learning

To learn about digital signatures (also known as digital ID), what they can be used for, and how to them in Word, Excel, and PowerPoint, see All about digital signatures. Create a signature line in Word or Excel In the document or worksheet, place your pointer where you want to create a signature line. On the Insert tab, select Signature Line in the Text group. In the Signature Setup dialog ...

When composing an email message, you might see some symbols within your text. These are actually formatting marks, such as dots (for spaces) or arrows (for tab characters) in Outlook. Formatting marks assist with text layout. They do not appear on a printed message. When you turn formatting marks on or off, your choice remains in effect for all subsequent messages you compose, reply to, or ...

Open the app, go to the app's top-level menu, and then select Send feedback. After that, contact Support or go to the Microsoft Authenticator app forum and explain the problem you're seeing and the steps you tried.