It is not secure. Plus subsequent versions actually handle memory a little better.
‘Secure’ is a relative term. If the XP system is not connected to the internet, there is little risk. A decent virus detector is sufficient protection. I have two XP development systems hooked to a LAN, a LAN that does not have internet access. No problem.
Does anybody know if this includes ATM machines? I read that they still run largely on XP. But that’s not an issue since they’re connected only on the banks’ internal networks. I wouldn’t be surprised if this high XP count is due to many other internally networked PC’s in businesses.