Hey guys,
I appreciate everyone chiming in! One of my Symantec contacts told me that the uninstall method varies depending upon the agent version which explains why everyone responded a bit differently. Apparently it's best to run the 2 commands in that HOWTO I mentioned for 7.1 clients whereas you can just use "AeXNSAgent.exe /uninstall" for 7.5 and later.
Anyhow, the real reason for my post is due to my AppID account frequently getting locked out because of old 7.x clients out there in my SMP 8.0 environment. Unfortunately the source of these lockouts all point to our BlueCoat proxy server instead of the workstations themselves where both Symantec Support and my security guys couldn't help me (i.e. would be nice if I had proof or a list of these source PCs).
So what I'm doing now is going through the Agent Version report and what the 32/64-bit agent upgrade policies are showing as targets to compile what I think is a complete list of these rogue 7.x clients that are failing to upgrade. Already tried uninstalling via the SMC which got to a few of them so have to manually remove Altiris from the rest. Very frustrating when my AppID account can lock within a minute and it all started when I reset my AppID password to the exact same thing late last month...waaah.