No need, the entirety of a building from a Uni I went to runs on XP with the last security patches and browsers that are built for xp compatibility like Supermium with security extensions. They never got hacked. No issues at all and the students can connect to the internet all they want, they aren't even monitored besides checking they still work once in a while. This is because despite lack of funding for new PC's, the security department is competent and actually knows how to work around that, as opposed to just saying what you are all saying here. There are Win7 machines there too, which can be remotely accessed via internet. There's a magical thing called a firewall. Did you know routers also have a firewall? Crazy right? Did you also know that almost all PC's are connected to routers, not directly to the internet? Crazy too, right? That's like basic level security knowledge. If you're so terrified you will be hacked that you're willing to put up with Microsoft's shit, i feel bad for you all.