Save your eyesight for Edward + Mrs. Simpson from 1980!
This version from 2005 was just a flimsy remake of a really good mini series.
http://www.imdb.com/title/tt0080212/
Edward Fox was perfect as the Duke (even LOOKED like him, imagine that!) and Cynthia Harris was just ugly enough to make you wonder what the heck he was thinking when he gave up his crown and throne for the woman he loved!
Nothing against Cynthia Harris... she is quite lovely in real life, but certainly could pull off the unlovely and neurotic Wallis.
And why end with the wedding? So much more happened afterwards. The snubbing by all the royal family (almost a banishment), Wallis's endless spending, the Duke's involvement and interest with Germany & Hitler, their rather shallow society life, their many houses and style of living, etc.
Not that the 1980 version goes into this period either, but the Duchess was still alive and perhaps out of respect for her they refrained.
But this new version could have easily shown their later life.