I use a different approach with NAV. The logon script is still used to see if NAV is installed and if not will force it but that's all I do from logon. NAV takes care of pattern updates (most of the time).
I run an admin script that browses the network periodically looking for NAV version and pattern version.
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Give a man a fish and he will be back for more. Slap him with a fish and he will go away forever.
