In Gpg4win 2.3.0 read support for MIME messages was enabled
for Outlook 2010 and higher.

This is good for OpenPGP, but it causes a problem for people using
the Outlook internal S/MIME support.

Thus it should be a configuration option.

For Gpg4win 3-testversion this is already implemented,
the default being GnuPG S/MIME support **off*.
Rationale: users already using S/MIME with Outlook-intern are not disturbed on
installation and users that set out to freshly use S/MIME (with GnuPG) can
enable the support explicitly.

So we need release planning or backporting or something to fix this issue for
stable gpg4win.