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 It issues digital certificates, signs certificates to verify their validity and tracks which certificates have been revoked or have expired.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 ...

Select Edit contact, and then select Save & Close. View a certificate for a contact On the Navigation bar, select People. Select the person's name, and then on the Contact tab, select Certificates. Digitally sign a single message in classic Outlook In the message, on the Options tab, in the Encrypt group, select Sign.

To create an e-sign request, you’ll need to sign into your account with an available e-signature provider such as Adobe Sign or DocuSign. If you don't have account, it's easy to start a free trial or create an account. Choose the e-signature provider you'll use to create, send, and manage e-sign requests.

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

Whether it’s a new job title (congratulations!) or a phone number change, make sure you keep your email message signature up-to-date. If you're using new Outlook, for more information about email signatures, or if you haven’t created one yet, see Add a signature to messages. Select File > Options > Mail > Signatures. Select the signature you want to edit, and then make your changes in the ...

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

How to add a signature to your Word documents. You can also use the Signature Line command in Word to insert a line to show where to sign a document.

Contact your admin if you need help. Support options are available to admins who can sign in to the Microsoft 365 admin center with their admin account to contact support on behalf of users in their organization.