Save a digital email message with an attached certificate (smime.p7s) from a signed message using Outlook.

Save a digital email message with an attached certificate (smime.p7s) from a signed message using Outlook. 

When you receive a signed or encrypted message, you can save the digital certificate of that person in your Contacts List. You first need to use your right mouse button and select the senders details:

This will give you the following screen, Select "Add to Outlook Contacts":

To check the certificate has been added to your contacts details, Click the "Certificates" tab. The certificate should be listed here: Click "Save and Close" to save it in your contacts.

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Importing a downloaded digital certificate.

You can search for a digital certificate in an online database such as GlobalSign's, download the certificate and add it to your Contact details of your contact so that you can send an encrypted message to that person.
To import a downloaded digital certificate in your Contacts List:

•       In Outlook 2007, create a new address or open an existing one in your Contacts List
•       Choose "Certificates"
•       Choose "Import"
•       Select the downloaded file with the digital certificate and choose ‘open’

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republished from http://www.globalsign.com/support/personal-certificate/per_outlook07.html