[Zope] Encrypted EMail with ZSMime

We have implemented encrypted email using M2Crypto and ZSMime (thanks Ng!) in the past using Netscape Messenger with no problem. However this time, we need to implement it using Outlook as an email client. We can successfully import the certificate (created with OpenSSL) into Outlook, but it dooes not appear as an option when we try to set up an individual account for encryption. Any clues would be appreciated. Bob Corriher P-Wave Inc.