I migrated two (out of 10) NW51SP8 servers to NW65SP8 (all in the same eDir
tree). The two NW65 are using TFS volumes as are the NW51 servers. All OK.
Now I'm looking at NSS, using vcu to migrate from TFS to NSS.

The vcu documentation warns me NW51 servers cannot access the new (NSS)
volumes. So the logical thing would be first to migrate the remaining NW51
servers to NW65 before converting any TFS volumes to NSS. Is this correct?
Or can I convert the NW65 servers to NSS without breaking (for example) eDir
communication ?