Dan,
Fortunately, my AC server is the only computer in my office still running XP (except for the proprietary software running on my topographer and ocular coherence tomographer - which cannot be updated, because the manufacturer, Zeiss, was too short-sighted to go with a newer OS). Fortunately, none of these computers directly access the internet. It will be sad to see the old XP work-horses retire to pasture. It was an excellent OS and much easier to work with than its successors.