Microsoft Outlook uses certificates (certificate: A digital means of proving your identity. When you send a digitally signed message you are sending your certificate and public key. Certificates are issued by a certification authority, and like a driver's license, can expire or be revoked.) in cryptographic e-mail messaging to help provide more secure communications. To use cryptography when you send and receive e-mail messages, you must first obtain a digital ID (digital ID: Contains a private key that stays on the sender's computer and a certificate (with a public key). The certificate is sent with digitally signed messages. Recipients save the certificate and use the public key to encrypt messages to the sender.) from a certificate authority (certificate authority (CA): An entity, similar to a notary public, that issues digital certificates, keeps track of who is assigned to a certificate, signs certificates to verify their validity, and tracks which certificates are revoked or expired.) (CA). Digitally signing a message applies the sender's certificate and public key (public key: The key a sender gives to a recipient so that the recipient can verify the sender's signature and confirm that the message was not altered. Recipients also use the public key to encrypt (lock) e-mail messages to the sender.) to the message. Your certificate is sent with the message to help authenticate you to the recipient.
A certificate contains a contact's public key. After you add or import the certificate to your contact list, Outlook can use it to verify digitally signed mail from the contact.
What do you want to do?
Add a contact and certificate received in an e-mail message to your contact list
- Open the digitally signed message from the recipient.
- Right-click the name in the From box, and then click Add to Contacts on the shortcut menu.
- If you already have a contact entry for this person, select Update new information from this contact to the existing one.
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Import a certificate into your contact list
- In Contacts, open the contact form (contact form: A view of an individual contact that contains all the information stored in the contact.) for the contact whose certificate you want to import.
- On the Contact tab, in the Show group, click Certificates, and then click Import.
- Locate and select the certificate file that you want, and then click Open.
Note Certificate files have either a .p7c or .cer file extension.
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Add a certificate to the Global Address List
This feature requires you to use a Microsoft Exchange Server 2000, Exchange Server 2003, or Exchange Server 2007 account. Most home and personal accounts do not use Microsoft Exchange.
- On the Tools menu, click Trust Center.
- Click E-mail Security.
- Click Publish to GAL.
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