By UN support, I suppose you mean if the French had chosen to be more cooperative with the "second UN resolution". It's possible that the invasion, occupation, and sequent transition phase could have been avoided. In that case, I think that at least at large portion of those soldiers would be alive today. But we wouldn't have gotten to our current situation in Iraq- which on balance I see as an "improvement" unlike others that see it as a "disaster".
Said differently, through negotiation route of France agreeing on passing a second resolution, probably the result in the relatively near term would be an Iraq sort of similar to Egypt or at least Syria. In this altered reality, Saddam could still be in power- with a bit of brain power Saddam could have negotiated himself into a more "respectable" monarchy type role.

But if you mean by UN support- sending in soldiers with blue helmuts, that probably have been a train wreak with more blue helmuts dead and Iraq in a civil war.