Michael has an old Dell computer running XP Pro, but is wondering how long he'll be able to continue with it. Leo says that Windows XP is pretty solid. He really doesn't have to worry about it being left behind in the near future unless a particular program requires a new version.
In about a year, Microsoft will stop updating the OS with security patches. So he should be able to safely use it for at least a year yet. Hackers will likely just move on to Windows 7 and 8 anyway. In fact, most attacks don't occur on Windows anymore, but third party applications like Flash, Java, and Adobe Reader.