FSX is my favorite sim of all time, I owned and tweaked my sim world from the boxed edition for years, my hard drive crashed and MSFT would not re-activate my CD keys so I was forced to buy it again from Steam, I am glad I did. Steam did a great job of packaging in a few fixes and enhancements while keeping it completely compatible with all my previous library of addons and mods. Thanks for saving my life long hobby, I've got my sim world put back together finally and its even better. And the best thing I like is I can always repair/re-install from steam if I have a hard drive crash again.