How can I use a Verisign digital ID with TB?

Is there a way for me to renew my Verisign digital ID and install it so
that TB uses it for S/MIME messages?  If so, can someone point me to a
step-by-step procedure?

I've been thinking of renewing my Verisign ID for correspondents who
have only S/MIME, but since I've stopped using Outlook Express there
isn't much point in renewing unless there's a way to make the ID work
with TB.  Pointers and suggestions most welcome.

-- 
Anthony
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Using The Bat! v3.0.1.33 on Windows XP 5.1 Build 2600