I think Mojave is Windows Vista with Service Pack 1, so maybe they've fixed a bunch of bugs from the initial release and they want a clean slate. They're making it sound as if what they were showing people was the same as what they originally released and I don't think it is. I'm a big believer in not buying ANY software till it's been out for a while and they've issued some fixes. Except for my laptop, where I was stuck with Vista due to lack of drivers, I'm still using XP. Maybe I'll switch to Vista when Service Pack 2 is released.