On December 19, 2007, Microsoft signed a five-year, $500 million contract with Viacom that included content sharing and advertisements. The deal allowed Microsoft to license many shows from Viacom owned cable television and film studios for use on Xbox Live and MSN. The deal also made Viacom a preferred publisher partner for casual game development and distribution through MSN and Windows. On the advertisement side of the deal, Microsoft's Atlas ad-serving division became the exclusive provider of previously unsold advertising inventory on Viacom owned web sites. Microsoft also purchased a large amount of advertising on Viacom owned broadcasts and online networks, and collaborated on promotions and sponsorships for MTV and BET award shows, two Viacom owned cable networks.