I talk about S/MIME Managing:
S/MIME (Secure/Multipurpose Internet Mail Extensions) is a standard for
public key encryption and signing of email encapsulated in MIME. S/MIME
provides cryptographic security services for electronic messaging
applications, such as authentication, message integrity, and
non-repudiation of origin (using digital signatures) and privacy and
data security (using encryption). S/MIME features are supported for
select Motorola handhelds.
This guide assumes that your Exchange environment is configured for
S/MIME and that you are conversant with S/MIME and its uses in your
Exchange installation, or that your PKI (Public Key Infrastructure)
administrator or Certificate Authority administrator will be available
to provide information to assure that you configure Good Messaging
correctly.