http://www.techweb.com/se/directlink.cgi?INW19980216S0024
"(...)
Among U.S. campanies, momentum is building in favor of S/MIME. Both
Microsoft and Netscape Communications have S/MIME clients and Lotus and
Novell have announced support for S/MIME. Only Qualcomm Inc., maker of
the Eudora E-mail client, supports PGP/MIME.
At the IETF, the S/MIME working group is about one month away from
completing its work on the specification. The OpenPGP group, however, has
not updated the draft of its specification since October, when group
members identified a number of problems. Both groups had agreed to submit
their final drafts next month, but it is unlikely the PGP group can
finish.
If that is the case, S/MIME by default could emerge as the dominant standard."