We're slowly upgrading our servers from nw5.1 running zfd4 components to
nw6.5. We'd like to phase in zfd7, so we intend to keep running the zfd4
components after we upgrade to nw6.5. The only issue with this is that
the zfd4 middle tier server isn't supported on nw6.5.

My question is: can we run a nw6.5 server with all the zfd4 server
components except middle-tier, and run the zfd7 middle-tier on the same