The big news is that NFS Server support is no longer a separate feature! Along with TCP/IP, it is now part of the base for z/VM Version 4, Release 1.0.

How do you tell which release level is running on the server?

Do you want more information about the changes introduced in TCP/IP level 420, TCP/IP level 3A0 for z/VM Version 3 Release 1.0, TCP/IP level 320 for VM/ESA Version 2 Release 4, or TCP/IP level 310 for VM/ESA Version 2 Release 3?