In part two, it was mentioned that to change the IP address of Symantec Messaging Gateway one gets onto the console as admin, runs delete osconfig, reboots, and then re-configures the IP settings from the console.
In 9.5 I did this and it worked, but I made a few changes and commited them. The IP address reverted to the old IP.
So I figured out that to make this change stick the steps are:
Immediately after running delete osconfig and the first reboot, one must log into the GUI
Go to administration / configuration / edit / Ethernet - make the IP changes again on this screen.
Then click save to make these changes stick.
This is posted for others reference as well as my future reference, as I am sure I'll forget this the next time I have to