Duetto, hospitality's only Revenue Strategy Platform, announced today the closing of an $80 million Series D financing round led by funds affiliated with Warburg Pincus, a leading global private equity firm focused on growth investing. The round is the largest ever non-acquisition investment in a software company serving the hotel industry. Duetto was founded in 2012 by CEO Patrick Bosworth, Chief Marketing and Strategy Officer Marco Benvenuti and Chief Technology Officer Craig Weissman, the former CTO at Salesforce.com.