VPIM did not ignore mixer. RFC1911 and 24212 refers to mixer as the
normative reference for sensitivity and importance. VPIM profiled how to map
these to existing semantics in the voicemail world, where there is no
equivalent to company confidential. Because there was no hope of advancing
mixer, when it was time to advance VPIM to draft, the VPIM WG was advised to
define these two fields directly. Every effort was to make the definitions
consistent.
If Mixer comes back to life, we may have to do some work to make sure the
paperwork matches the intention (and current reality) that these be the same.
In the very unlikely event that this ever happens (Oh look! The pigs have taken
wing!) the right thing to do IMO would be to sync the MIXER revision with VPIM,
not the other way around. There are probably more VPIM systems in use now than
there ever were MIXER gateways in their heyday. And I speak here as the author
of a MIXER gateway who has never done a VPIM implementation.
Ned