Barth .. one special note with regard to managing the GPO for the WUAgent configuration. The GPO sets registry values, but merely removing the GPO will not remove those registry values. What you'll actually need to do is configure the GPO with the opposite value and refresh group policy to disable the WUAgent. Specifically you'll want to set two policies: Specify intranet update service location should be DISABLED and Configure Automatic Updates should be DISABLED. The former will unmake the system as a WSUS client; the latter will disable the AU functionality completely.
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