Not sure if anyone is still looking here.
We're busy migrating our Zen7 envirioment to Zen10 and so far we have about
half our desktops moved over, but our Zen7 server is starting to malfunction
to a point where it is preventing people from logging in properly.
What are the effects of just removing this server from the tree while we
still have active Zen7 clients ? (there is no backup Zen 7 server)

We do not use imaging from Zen7, only the NAL and inventory, although
inventory from Zen 7 is not a big deal if its no longer available. As long
as applications are still working just removing this server is a viable
option as opposed to trying to fix the problems and possible breaking the
whole server anyways.