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Bugs, Security fixes and improvements
Over the years people discover design flaws that limit capabilities (security, flexibility, stability). Often times these design flaws when corrected cause applications that rely on those particular capabilities to break. Some times it is possible to do some work around stuff to get it running, but sometimes it isn't. I can tell you that I do some security work and when we hook an XP box it makes my day because it is so much easier to manipulate than any of the later MS OS's. Sure, stay on XP, but don't complain if your computer gets taken over and all your data shipped off to a different country.