MacOSX uses Kerberos V, which typically includes a pretty useable krb4 legacy
support mode.
I ducked out of the corporate world before I had to care about widespread
kerberos support from Microsoft, but a few seconds with google shows their
documentation using several terms that only make sense with krb5. I wouldn't
be surprised if there are old MS installations still using krb4, but I doubt
that there are many that care about nmh.
Hope that helps,
*Chad
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