Capt Pit Bull :
excellent remark about focusing on the fact that an aircraft should NEVER be manouevred in the opposite sense to an RA. . If this only would be understood and followed by all pilots, most of our problems will be solved ( except for encounters with SSR-only intruders of course)
Quick reply :
ATC Watcher: Are there still 6.04 users flying around?
Still a lot in the USA to start with. In a recent publication ( March 2007) the FAA ATO reported that :
" US aircraft were not mandated to equip with Version 7, but Europe elected to mandate this version. Therefore, US aircraft flying into European airspace must have TCAS Version 7 avionics. Currently, two thirds of the US commercial fleet is TCAS Version 7 equipped.."
Which means 1/3 of commercial fleet is still on 6.04 and some of General aviation jets and turboprops on top of that I guess .
Rest of the world : status unknown on the domestic fleets. All in all , still a fairly large number, I would say.