A digital signature is an electronic, encrypted, stamp of authentication on digital information such as email messages, macros, or electronic documents. A signature confirms that the information originated from the signer and has not been altered.

Let users install the mobile apps for Office and Microsoft 365, then help secure the data with Mobile Device Management (included with Microsoft 365), or Microsoft Intune, or Microsoft Enterprise Mobility Suite.

You can modify your email signature or create a new one to include links to your Facebook or X (formerly Twitter) profiles. To get started, make sure you save copies of the Facebook and X (formerly Twitter) icons to your computer.

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All you have to do is get the template, copy the signature you like into your email message and personalize it to make your own Outlook signature. Check out the video to see how it's done.

If you plan to exchange digitally-signed documents together with other people, and you want the recipients of your documents to be able to verify the authenticity of your digital signature, you can obtain a digital certificate from a reputable third-party certificate authority (CA).

All you have to do is get the template, copy the signature you like into your email message and personalize it to make your own Outlook signature. Check out the video to see how it's done.

To add a handwritten signature, sign your name in the box next to the X by using the inking feature. To use an image of your written signature, choose Select Image.

Open the digitally signed message. Look at the Signed By status line to check the email address of the person who signed the message. It isn't enough to check the email address in the From line—you want to verify who actually signed the message, not only who sent the message.

The Signature Details dialog box displays certificate information such as the signer’s name in the Signing as box, and who issued the certificate. Open the file that contains the certificate you want to view.