[majke]

highly-scalable - now:maybe, year ago:no

multicast - are there still stupid limits on max number of subscriptions?

real-time - sort of. have you measured the latency? depends what you mean by realtime.

distributed message passing system - distributed:yes, message passing:it depends what you mean. is polling considered as messaging?

archiving - what?

deletions - doesn't remove the items from search. I consider it as not-working.

dynamic subscription changes - yes.

access restrictions - sort of.

open API - yes

...