Assigning a certificate in Outlook 2007 is only slightly different from older versions.
Previous versions set the certificate (Digital ID) in the 'Security' tab under 'tools', 'Options'.
Outlook 2007 has a new option 'Trust Center' under the 'tools' menu. Then select 'E-mail Security'.
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Click on 'Settings' to display the security settings.
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Click 'Choose' to set the certificate (Digital ID) to use for 'Signing' and 'Encryption'
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