If you want your personal certificate on other computers or devices, you will need to export it. Note:Your certificate is only available on the computer and user account where you install it.
The certificate is now available for Apple Mail, Outlook, and other applications that can use client certificates. The certificate will be installed on your Mac and will appear in the 'My Certificates' section of Keychain Access.
This article will go into detail on how to install certificates on OS X Apple Mail/Outlook.