Secure MIME (S/MIME) is the Internet’s de facto standard for secure messaging. Many organizations use S/MIME to bootstrap the rollout of a corporate public key infrastructure (PKI). In "Advanced Security in Exchange 2000, Part 1," May 2000, I introduced S/MIME’s secure messaging capabilities and reviewed the new S/MIME features in Microsoft Exchange 2000’s Key Management Server (KMS). Moving to the client...