Last I checked, almost all applications I have on my XP is being supported by software developers (given that I don't have many). From the perspective of Office, all open-source alternatives to MS are supporting XP. Firefox is still supporting XP. Chrome and Opera does as well. So are you suggesting that they are breaking the security model by supporting XP. Why would they? I have yet to see any disclaimer from any of them that says that I should use their software on AS IS basis.