Article is a Disservice
This entire article is a disservice to all corp products. Useless at best. To start with; The single point of failure premise doesn't hold much water. For the small business (100) the corp product is installed on a primary server. If that server crashes, nothing else works anyway. For a larger organization, alternate or secondary servers would "almost" always be in place. Yeah, there is always the inbetweeners, but...
I love the statement "Timing your updates is also an important consideration with a centrally managed solution. Because new viruses are being continuously discovered, virus updates are sometimes released on an irregular basis. This can cause a problem if your organization doesn't use a fairly frequent update schedule." My god man, this is 2004! Back in '85 you could update every few months, in '98 once a month, in '01 once a week. If you are not updating virus protection every day (corp or retail) you deserve everything you receive.
Proper configuration of whatever product you select is absolutely essential. Spend some time with a true "mostly" unbiased review of all the corp products available. If I could, I would put corp on every lan of 2 or more stations because I can properly lock it down so the end users can't tinker, disable, or otherwise get themselves in trouble. And any product that requires that antivirus protection be turned off to install needs to have the installation process rewritten.
This article was a poor attempt to have a published article on Mr. Edwards resume, a waste of my time, and provided more spam for my mailbox.