I have two domains setup in a trust and I'm curious what would happen
in the following scenario.

Domain A has a file server that users from both domains access. I want
to join this server to Domain B and do away with domain A. Matching
accounts / groups are already setup across both domains. I have gone
into each of the shares on this server and added permissions for the
matching groups from Domain B.

What will happen to those permissions if I remove the server from
Domain A and join it to Domain B? I assume they should still be valid,
though I will have a lot of dead sids (from domain A) in a lot of my
folder permissions. Is this correct?

Thanks!