Odds are it was one big movie Dianna, just made into what they call a mini-series....it was done by CBS as you know and instead of showing a big, straight four hour long movie they divided it up into two hours for two nights - showing the first half one night and the rest the next; when you saw it in 4 parts it could be that they divided it up into a hour each day where you are or that you actually saw it twice - the two parts two times....if you get what I'm saying.
But it is what you call a mini-series CBS did which is a movie for them technically, it's just broken up into parts instead of having viewers watch a bit long movie and getting bored with it and changing durning parts which would lose some ratings for them and the network definitely wouldn't want that as you know. But a great thing now, if anyone missed, it - it's out on DVD now so check your local Movie Gallerys at least because that's where I rented my copy. Haven't watched it yet I must say, but they had two copies there so it might be worth the rent for those who haven't seen it and those who want to see it again.
Hope this helps.